Infectious Diseases, Misc

This is an introduction to the topical collection Microbes, Networks, Knowledge: Disease Ecology in the twentieth Century, based on a workshop held at Queen Mary, University London on July 6–7 2016. More than twenty years ago, historian of science and medicine Andrew Mendelsohn asked, “Where did the modern, ecological understanding of epidemic disease come from?” Moving beyond Mendelsohn’s answer, this collection of new essays considers the global history of disease ecology in the past century and shows how epidemics and pandemics (...) have made “microbes complex”. (shrink)

Tuberculosis en América Latina y el Caribe: reflexiones desde la bioética Tuberculose na América Latina e no Caribe: reflexões da bioética The objective of this article is to analyze the conditions of access to health services by people with tuberculosis in Latin America and the Caribbean, reflecting on the public health aspects involved from a bioethical perspective. A literature review of the context of tuberculosis in LAC based on epidemiological data was performed. The results were analyzed from its relationship with (...) the social determinants of health and the ethical principles that guide medical practice. Tuberculosis is a pressing public health problem in the region because of its family, social, economic and health impact. It mainly affects vulnerable individuals and populations. Health services violate ethical principles. Tuberculosis is a serious ethics and public health problem in the region that causes death, disability and increased poverty. It is imperative to ensure the right to health services and to understand the individual and public health consequences of non-adherence to treatment. It is important that national tuberculosis control strategies include principles of dignity and non-discrimination of the sick, changes in the social determinants of the disease, and respect for the ethnicity, language culture and identity of patients. Para citar este artículo / To reference this article / Para citar este artigo Muñoz del Carpio-Toia A, Sánchez-Pérez HJ, Verges de López C, López-Dávila LM, Sotomayor-Saavedra MA, Sorokin P. Tuberculosis en América Latina y el Caribe: reflexiones desde la bioética. pers. bioét. 2018; 22: 331-357. DOI: 10.5294/pebi.2018.22.2.10. (shrink)

The 2016 outbreak of the Zika arbovirus was associated with large numbers of cases of the newly-recognised Congenital Zika Syndrome. This novel teratogenic epidemic raises significant ethical and practical issues. Many of these arise from strategies used to avoid cases of CZS, with contraception in particular being one proposed strategy that is atypical in epidemic control. Using contraception to reduce the burden of CZS has an ethical complication: interventions that impact the timing of conception alter which people will exist in (...) the future. This so-called ‘non-identity problem’ potentially has significant social justice implications for evaluating contraception, that may affect our prioritisation of interventions to tackle Zika. This paper combines ethical analysis of the non-identity problem with empirical data from a novel survey about the general public's moral intuitions. The ethical analysis examines different perspectives on the non-identity problem, and their implications for using contraception in response to Zika. The empirical section reports the results of an online survey of 93 members of the US general public exploring their intuitions about the non-identity problem in the context of the Zika epidemic. Respondents indicated a general preference for a person-affecting intervention over an impersonal intervention. However, their responses did not appear to be strongly influenced by the non-identity problem. Despite its potential philosophical significance, we conclude from both theoretical considerations and analysis of the attitudes of the community that the non-identity problem should not affect how we prioritise contraception relative to other interventions to avoid CZS. (shrink)

This study investigated the relationship between hospital nurses’ professional care obligation, their attitudes towards SARS infection control measures, whether they had ever cared for SARS patients, their current health status, selected demographic characteristics, and the time frame of the data collection (from May 6 to May 12 2003 during the SARS epidemic, and from June 17 to June 24 2003 after the SARS epidemic). The study defines 172 nurses’ willingness to provide care for SARS patients as a professional obligation regardless (...) of the nature of the disease. A conceptual model was developed and tested using ordinal logistic regression modelling. The findings showed that nurses’ levels of agreement with general SARS infection control measures and the lack of necessity for quarantining health care workers who provided care for SARS patients were statistically significant predicators of the nurses’ fulfilling of their professional care obligation. Suggestions and study limitations are discussed. (shrink)

Se realizó una revisión bibliográfica con el objetivo de profundizar los conocimientos sobre el cólera y su historia. Se tratan aspectos relacionados con la etiología de la enfermedad, patogenia, cuadro clínico, tratamiento, epidemiología y prevención. El cólera es una enfermedad de origen multicausal donde intervienen factores biológicos, ambientales, sociales, políticos y culturales, la cual está resurgiendo como un problema sanitario de primera magnitud en muchos países. Para su erradicación es necesario desarrollar una fuerte promoción de salud en el seno de (...) la sociedad, garantizar atención rápida a enfermos y contactos e impedir la desorganización de la estructura social y económica en pro de la calidad de vida del ser humano. A bibliographical revision with the objective of deepening in the knowledge on cholera and its history was carried out. Some aspects related with its aetiology, pathology, clinical picture, treatment, epidemiology and prevention are considered. Cholera is an illness of multicausal origin where biological, environmental, social, political and cultural factors intervene. This disease is resurging as a sanitary problem of first magnitude in many countries. It is necessary to develop a strong promotion of health in the society to eradicate it, to guarantee a quick attention to sick and contacts and to impede the disorganization of the social and economic structure in favour of the quality of the human being life. (shrink)

Fear, anger and hopelessness were the most frequent traumatic emotional responses in the general public during the first stage of outbreak of the COVID-19 epidemic in the Czech Republic (N = 1,000). The four most frequent categories of fear were determined: (a) fear of the negative impact on household finances, (b) fear of the negative impact on the household finances of significant others, (c) fear of the unavailability of health care, and (d) fear of an insufficient food supply. The pessimistic (...) communications used by the Czech mass media contributed to intensifying traumatic feelings, fears and psychological distress in the general public during the outbreak of the COVID-19 epidemic. The anxious emotional tone of the messages and the presentation of selectively chosen “bad ending stories” contributed to the psychological traumatization of the Czech population. This form of communication was motivated by an effort to reach the broadest audience possible. Older adults were the most affected part of the population because of their isolation and their very limited opportunity to share their worries and emotions with others. The communication used by the Czech mass media during the outbreak of the COVID-19 epidemic is a representative example of a traumatizing form of media communication during an epidemic. (shrink)

Taiwan was affected by an outbreak of severe acute respiratory syndrome (SARS) in early 2003. A questionnaire survey was conducted to determine (1) the perceptions of risk of SARS infection in nurses; (2) the proportion of nurses considering leaving their job; and (3) work as well as non-work factors related to nurses' consideration of leaving their job because of the SARS outbreak. Nearly three quarters (71.9%) of the participants believed they were 'at great risk of exposure to SARS', 49.9% felt'an (...) increase in workload', and 32.4% thought that people avoided them because of their job; 7.6% of the nurses not only considered that they should not care for SARS patients but were looking for another job or considering resignation. The main predictors of nurses' consideration of leaving their job were shorter tenure, increased work stress, perceived risk of fatality from SARS, and affected social relationships. The findings are important in view of potential impending threats of pandemics such as avian influenza. (shrink)

Tuberculosis, caused by bacteria, usually affects the lung. Being airborne, TB has been one of the world’s deadliest communicable diseases. In spite of being curable and preventable, the disease has always been a continuous threat to human population. Moreover, there are cases of multidrug resistant, extremely drug resistant as well as HIV associated forms. Recognizing this grave threat, the World Health Organization urged every country to have a national program for tuberculosis prevention and control. After incidences of involuntary detentions of (...) people with suspected TB in some places, WHO also recommended that national TB prevention programs should incorporate ethical considerations in them. Specifically, it prescribed that human rights and social justice issues should be given due considerations. Studies suggest that India, following the international recommendations, has rolled down a national program to prevent and control TB cases in the country. However, neither is there much consideration of ethics in it, nor there is any pronounced effort to include social justice issues. The present paper investigates how the inclusion of elements from social justice theory can actually help India’s TB program to address the issue of equitable protection. Specifically, it shows how insights from JP Ruger’s ‘Health Capability Paradigm’ can help India’s TB strategies to render equitable protection by addressing health inequities. (shrink)

Diphtheria is an acute toxin-mediated superficial infection of the respiratory tract or skin caused by the aerobic gram-positive bacillus Corynebacterium diphtheriae. The epidemiology of infection and clinical manifestations of the disease vary in different parts of the world. Historical accounts of diphtheria epidemics have been described in many parts of the world since antiquity. Developed in the late 19th century, the diphtheria antitoxin played a pivotal role in the history of public health and vaccinology prior to the advent of the (...) diphtheria-tetanus toxoids and acellular pertussis vaccine. One of the most significant demonstrations of the importance of DAT was its use in the 1925 diphtheria epidemic of Nome, Alaska. Coordinated emergency delivery of this life-saving antitoxin by dog-sled relay in the harshest of conditions has left a profound legacy in the annals of vaccinology and public health. Lead dogs Balto and Togo, and the dog-led antitoxin run of 1925 represent a dynamic illustration of the contribution made by non-human species towards mass immunization in the history of vaccinology. This unique example of cooperative interspecies fellowship and collaboration highlights the importance of the human-animal bond in the one-health initiative. (shrink)

Eh!woza is a public engagement initiative that explores the biomedical and social aspects of tuberculosis in South Africa. The project is a collaboration between scientists based in an infectious disease research institute, a local conceptual/visual artist, a youth-based educational non-governmental organization and young learners from a high-burden TB community. The learners participate in a series of interactive science and media production workshops: initially presented with biomedical knowledge about TB and, in later sessions, are trained in creating documentary films and engage (...) with ideas around visual representation. The participants are encouraged to make use of this newly acquired knowledge to tell stories from their chosen communities in Khayelitsha, a township in Cape Town. Through its engagement with the complex manner in which TB is experienced, framed and understood by biomedical scientists, young people, and those who have been affected by the disease, Eh!woza presents alternative ways of exploring the complexities of human illness. The integration and interrogation of biomedical understandings, lay narratives and the young participants’ framing of the disease poses questions about ’knowing', and the meanings people attribute to ways of ’knowing' and the actions they impel. The project also presents contrasting reflections on cure—from a biomedical perspective, and care—from the perspective of TB-affected young people and community members. In this article, we describe the Eh!woza project, present thoughts from the participating students on the science and media workshops, and detail the narratives of ill-health and disease from people within their neighbourhoods. We conclude with a critical analysis of the complexities of knowledge communication, notions of cure versus care, and a consideration of the potential contribution of this project to the growth of medical humanities in Africa. (shrink)

The aim of this study was to analyze nurses' experiences of role strain when taking care of patients with severe acute respiratory syndrome (SARS). We adopted an interpretive/constructivist paradigm. Twenty-one nurses who had taken care of SARS patients were interviewed in focus groups. The data were analyzed using thematic analysis. The self-state of nurses during the SARS outbreak evolved into that of professional self as: (1) self-preservation; (2) self-mirroring; and (3) self-transcendence. The relationship between self-state and reflective practice is discussed.

The first of these is not a single disease but a group of three: ‘all the clinical and epidemiological evidence described by Thucydides’ ‘can be attributed to infection with influenza virus complicated by a toxin-producing strain of noninvasive staphylococcus’. This initial analysis is in fact supplemented by bullous impetigo in an attempt to explain the marked skin symptoms which are not ascribable to the other two diseases: streptococci produce flushes of the skin that end in desquamation – something which Langmuir (...) et al. admit T would have described if present. (shrink)

The first of these is not a single disease but a group of three: ‘all the clinical and epidemiological evidence described by Thucydides’ ‘can be attributed to infection with influenza virus complicated by a toxin-producing strain of noninvasive staphylococcus’ . This initial analysis is in fact supplemented by bullous impetigo in an attempt to explain the marked skin symptoms which are not ascribable to the other two diseases: streptococci produce flushes of the skin that end in desquamation – something which (...) Langmuir et al. admit T would have described if present. (shrink)

This article addresses an important, overlooked regulatory challenge during global health emergencies. It provides novel insights into how, and why, best practice can support decision makers in interpreting and implementing key guidance on conducting research during GHEs. The ability to conduct research before, during and after such events is crucial. The recent West-African Ebola outbreaks and the Zika virus have highlighted considerable room for improvement in meeting the imperative to research and rapidly develop effective therapies. A means of effectively capturing (...) these experiences and folding them into future decision-making is lacking; the need for effective practical translational measures remains. The challenge for the research community lies in extracting meaningful action-guiding content from pre-existing guidelines—which draw upon practical examples of guidelines ‘in action’—that assist in determining how to act in a particular situation. Insights are provided into the role of best practice as a means to do so; such examples can provide invaluable support to decision makers in interpreting high-level guidance; overarching guidelines retain their necessary level of generality and flexibility, whilst corresponding best practice examples—which incorporate important lessons learned—illustrate how such guidelines can be interpreted at a practical level. (shrink)

Herbert, Dilinie The Zika virus has dominated the news media and captured the attention of the international community. Epidemic disease has become the mainstay of public health emergencies in our recent past with Ebola virus in West Africa and now Zika virus in Latin America. An unexpected and troubling feature of this current outbreak is the high incidence of birth defects and neurological health complications. As scientists investigate a possible causal link, health authorities as well as Catholic Church leaders are (...) involved in communicating how women and the wider community should make decisions about their health, reproduction and pregnancy. A morally appropriate, culturally sensitive and socially inclusive approach to managing the immanent risk should be the priority. (shrink)

In spite of the fact that in recent years many steps have been taken in the control of zoonotic diseases, we are still confronted with recent outbreaks of, for example Ebola and Avian Flu and with public debates on the preferred way to deal with zoonoses. Such debates can easily get polarised. Therefore, we argue that a more integrated approach is needed. In this paper we propose an integration on three levels. First, the One Health initiative could serve a fruitful (...) approach to take the interrelatedness of human and animal health into account. Second, we argue that it might be fruitful to approach societal controversies about how societies should respond to zoonotic risks not by focusing on conflicting interests, but as conflicts between broadly shared values. Finally, an effective approach of and a discussion on zoonoses require a more sophisticated view on moral responsibilities, which goes beyond the level of the question ‘who is to blame?’ for a specific outbreak. In this paper we claim that although finding acceptable and well-justified policies will remain a difficult task, these three steps towards a pluralistic approach to thinking about prevention of and response to zoonosis outbreaks may create possibilities to overcome conflicts. (shrink)

Responses to public health emergencies can entail difficult decisions about restricting individual liberties to prevent the spread of disease. The quintessential example is quarantine. While isolating sick patients tends not to provoke much concern, quarantine of healthy people who only might be infected often is controversial. In fact, as the experience with severe acute respiratory syndrome (SARS) shows, the vast majority of those placed under quarantine typically don't become ill. Efforts to enforce involuntary quarantine through military or police powers also (...) can backfire, stoking both panic and disease spread. Yet quarantine is part of a limited arsenal of options when effective treatment or prophylaxis is not available, and some evidence suggests it can be effective, especially when it is voluntary, home-based and accompanied by extensive outreach, communication and education efforts. Even assuming that quarantine is medically effective, however, it still must be ethically justified because it creates harms for many of those affected. Moreover, ethical principles of reciprocity, transparency, non-discrimination and accountability should guide any implementation of quarantine. (shrink)

Variant Creutzfeldt–Jakob disease is a fatal, transmissible, neurodegenerative disorder for which there is currently no effective treatment. vCJD arose from the zoonotic spread of bovine spongiform encephalopathy. There is now compelling evidence for human to human transmission through blood transfusions from presymptomatic carriers and experts are warning that the real epidemic may be yet to come. Imperatives exist for the development of reliable, non-invasive presymptomatic diagnostic tests. Research into such tests is well advanced. In this article the ethical implications of (...) the availability of these tests are elaborated and comparisons drawn with predictive genetic testing for Huntington’s disease and screening for HIV. Paramount to considerations is the issue of whom to test, weighing up respect for personal autonomy against obligations to benefit and protect society. A paradigm is proposed similar to that used for HIV screening but with unique features: compulsory testing of all blood/organ donors and individuals undergoing surgery or invasive procedures who have a significant risk of disease transmission. (shrink)

Variant Creutzfeldt–Jakob disease is a fatal, transmissible, neurodegenerative disorder for which there is currently no effective treatment. vCJD arose from the zoonotic spread of bovine spongiform encephalopathy. There is now compelling evidence for human to human transmission through blood transfusions from presymptomatic carriers and experts are warning that the real epidemic may be yet to come. Imperatives exist for the development of reliable, non-invasive presymptomatic diagnostic tests. Research into such tests is well advanced. In this article the ethical implications of (...) the availability of these tests are elaborated and comparisons drawn with predictive genetic testing for Huntington’s disease and screening for HIV. Paramount to considerations is the issue of whom to test, weighing up respect for personal autonomy against obligations to benefit and protect society. A paradigm is proposed similar to that used for HIV screening but with unique features: compulsory testing of all blood/organ donors and individuals undergoing surgery or invasive procedures who have a significant risk of disease transmission. (shrink)

For the past month, the nightly television news has been showing us animals being slaughtered. Governments in 10 Asian countries have killed more than 25 million ducks and chickens to stem the spread of avian flu. China has drowned thousands of civet cats suspected of spreading Sudden Acute Respiratory Syndrome, the often-lethal disease usually abbreviated to SARS. Here in the United States, more than 700 dairy cows, so far, have been killed in order to contain any possible spread of mad (...) cow disease. (shrink)

Throughout the 19th century and early decades of the 20th century, milk was a dangerous food that required state intervention to make it safe. Throughout this period, the germ theory of contagious disease came to prominence, but could not explicitly determine the causal relationships linking germs, milk, and human illness. Using the notion of an ideational regime, I examine how (1) knowledge claims move from uncertainty to certainty and become privileged claims within ideational regimes that (2) result in an unintended, (...) but necessary deployment of a biopolitical strategy for governance. The argument here is that theoretical uncertainty meant managing populations as a uniform undifferentiated reality using pasteurization technologies. I use two historical moments as evidence of these processes. The first is the 1901 British Congress on Tuberculosis when I argue germ theory came to a theoretical standstill and the second is Ontario’s 1938 amendment to the province’s Public Health Act that permanently institutionalised province-wide compulsory pasteurisation laws organised around the notion of nutritional equivalency. This genealogical exploration should provide some insight into how bacteria became the singular cause of illness and into the conditions that led to targeting milk as the main site of intervention instead of treating individual bodies. (shrink)

In the contemporary biomedical literature, every disease is considered genetic. This extension of the concept of genetic disease is usually interpreted either in a trivial or genocentrist sense, but it is never taken seriously as the expression of a genetic theory of disease. However, a group of French researchers defend the idea of a genetic theory of infectious diseases. By identifying four common genetic mechanisms (Mendelian predisposition to multiple infections, Mendelian predisposition to one infection, and major gene and polygenic predispositions), (...) they attempt to unify infectious diseases from a genetic point of view. In this article, I analyze this explicit example of a genetic theory, which relies on mechanisms and is applied only to a specific category of diseases, what we call “a regional genetic theory.” I have three aims: to prove that a genetic theory of disease can be devoid of genocentrism, to consider the possibility of a genetic theory applied to every disease, and to introduce two hypotheses about the form that such a genetic theory could take by distinguishing between a genetic theory of diseases and a genetic theory of Disease. Finally, I suggest that network medicine could be an interesting framework for a genetic theory of Disease. (shrink)

In the mid-1800s, there was much debate about the origin or 'exciting cause' of cholera. Despite much confusion surrounding the disease, the so-called miasma theory emerged as the prevalent account about cholera's cause. Going against this mainstream view, the British physician John Snow inferred several things about cholera's origin and pathology that no one else inferred. Without observing the vibrio cholerae, however,-data unavailable to Snow and his colleagues-, there was no way of settling the question of what exactly was causing (...) cholera and how, or if, it was passed on. The question then arises as to how Snow arrived at conclusions so systematically different from those of his opponents. In this paper, I want to look at Snow's reasoning in some detail, and show that there were certain principles, explanatory power in particular, that were epistemologically important to Snow in their own right. I will show that Snow himself takes explanatory power to be an epistemic property, and makes explicit links between explanatory power and confirmation. Systematically juxtaposing Snow's claims and his opponents', I will show that Snow was right to tout the explanatory power of his theory, and that his conclusions about the epistemic superiority of his theory over that of the miasmatists' were justified. (shrink)

This paper reassesses Robert Koch’s work on tropical infections of humans and cattle as being inspired by an underlying interest in epidemiology. Such an interest was developed from the early 1890s when it became clear that an exclusive focus on pathogens was insufficient as an approach to explain the genesis and dynamics of epidemics. Koch, who had failed to do so before, now highlighted differences between infection and disease and described the role of various sub-clinical states of disease in the (...) propagation and—consequently—in the control of epidemics. Studying pathologies of men and cattle in tropical countries eventually facilitated the application of such measures in Europe through the screening of healthy carriers of typhoid, which was carried out in 1902. The concept of the carrier state can be understood as a spin-off from tropical medicine into the study and control of infectious disease in Europe. With it travelled assumptions that were typical for colonial and veterinary medicine where the health of indigenous individuals or cattle would be a secondary objective compared to the control of diseases in populations. (shrink)

This essay is concerned with popular and biomedical accounts of the appearance of pellagra at the turn of the last century. Many of these accounts portrayed the disease as communicable despite early evidence to the contrary, which suggested it was attributable to nutritional factors. The nonspecific nature of its symptom profile, along with the enormous range of cure-alls offered to the public, made the etiology of pellagra open to a variety of interpretations. However, as the author shows, the infection paradigm (...) and genetic determinism hindered efforts to understand and treat pellagra. (shrink)

The germ theory of disease famously brought a new notion of specificity into concepts of disease. At the same time, the work of Pasteur, Koch and their colleagues was developed during the same decades as Charles Darwin's theories of evolutionary biology challenged traditional notions of the essentialism of biological species. This essay examines some of the ways in which Darwin's work was invoked by British doctors seeking to explain clinical or epidemiological anomalies, in which infectious diseases did not appear to (...) breed true. (shrink)

Robert Koch based his claim that specific microorganisms cause particular diseases on laboratory studies. This paper examines how Koch set up a plausible line of argument by using special methods of representing bacteria. One kind of representation consisted in making the bacteria visible; the other mode of representation was based on disease phenomena. Using a range of techniques of isolating and controlling microorganisms, Koch combined these different modes of representation in a way that made his claims convincing. Thus, the microorganism (...) as a specific cause of disease emerged through a chain of repeated processes of selection and representation in the laboratory. (shrink)

This paper attempts to show how leading contemporary disciplines influenced the discovery of Chagas' disease and the formation of the early disease concept. Chagas was among the first generation of Brazilian trained scientists who incorporated modern principles of tropical medicine in its research. Thus, Chagas was familiar with characteristics of vector borne tropical diseases such as malaria and yellow fever. The detection of a hitherto unknown trypanosome in the gut of a reduviid bug prompted him to search for a related (...) vector borne disease. Among the disciplines that were influential on Chagas' discovery and early disease description were pathology, entomology and parasitology. Parasitology as a new discipline was of crucial importance to tropical medicine and had a political dimension in the context of colonial medicine. Hence, leading scientists in tropical medicine were located in European countries and in the United States of America. One of these was the German Schaudinn School of Protozoology. The early description of American Trypanosomiasis can also be seen as a reflection of the Schaudinn School of Protozoology which dominated Chagas' scientific orientation towards parasitology with regard to the interpretation of the observed phenomena of the life cycle and the morphology and biology of T. cruzi. The first Chagas' disease concept was based on research of the biology and entomology of the trypanosome and its vector as well as on pathological studies of fatal cases. This concept was characterized by a confusion of some of the chronic forms of the disease, as iodine deficiency and goitre were endemic in some rural regions in Brazil. Therefore, early concepts of the disease faced strong opposition and even raised doubts about its existence. (shrink)

As fastidious human parasites, the respiratory viruses other than influenza viruses have been among the last of the human viruses to be isolated. Their recognition has been dependent upon the evolving technology of cell culture and equally upon a series of fortuitous observations by astute investigators. Adenoviruses were discovered independently by two different groups of scientists, one utilizing explantation of ostensibly normal human tissues and the other recovering virus directly from epidemics of acute disease. In other studies, a technique developed (...) for detection of influenza virus in cell culture led to the discovery of other hemagglutinating viruses, now known as parainfluenza viruses. From such shreds of laboratory evidence, the structural and molecular characteristics of these diverse viruses have been defined, and each in turn has been retrospectively linked to a legacy of previously described clinical syndromes and epidemic patterns. Thus, neither technology or human imagination alone is sufficient for scientific advance, but, when combined, are the essence of scientifc discovery. (shrink)

In his comprehensive Oeuvre, Galen of Pergamon, who interpreted and perfected Hippocratic medicine, made many times and in various contexts mention of the intermittent fevers, among which malaria undoubtedly held a prominent position. The following article gives an outline of Galen's theoretical concept of this infectious disease, which was of utmost importance for the history of Italy. Galen describes three different types of intermittent fevers, of which, according to his theory of humoural pathology, each one is caused by a special (...) humour with its respective qualities. Thus the quotidian fever is caused by phlegm, the tertian fever by the yellow bile and the quartan fever by the black bile. Apart from the three basic types of fever Galen describes a number of other mixed forms which can either be developed out of identical types or out of different ones. A mixture of a special kind is febris semitertiana: a continuous quotidian is accompanied by an intermittent tertian. It is the worst and most dangerous of these fevers. On the whole Galen's theory of malaria is a paradigm for his forming the reality of diseases on the basis of his pre-knowledge of humoural pathology into a closed system of theory. (shrink)

THE WISH "to know the cause of things" is as old as man- kind itself. In medicine the scientific period dawned at the moment when the question as to the connexion of disease with environment was clearly propounded by Diodorus and by Hippo- crates, "the father of medicine." In former times men were generally satisfied, and they are fre- quently satisfied to-day, with the vaguest conceptions of things, conceptions based on the common ground of a search after animate causes or (...) personifications. Universal knowledge is plainly unat- tainable in a given section of time ; hence men have always been forced to piece out in imagination part of the lacking facts,—that is to theorise; and the form such speculation takes on is naturally in accordance with the measure of cultivation prevailing at the time. Even now, as is clearly shown by a glance at the concep- tions of image-worship among educated and uneducated individuals and peoples, there is for wide strata of society an imperative neces- sity for personification, for animate cause... (shrink)