In a research proposal recently submitted to one of the research ethics committees in Wales, children suffering from otitis media, or ‘glue ear’ as it is more familiarly known, were to be tested for allergic reactions to a number of substances using skin-prick tests. Small lancets would be used to pierce the skin of the forearm, allowing the penetration of traces of the allergenic reagent. The size of the subsequent inflamed area of skin would be measured. To demonstrate the (...) expected correlation between glue ear and an allergic reaction, it would be necessary to see whether other children who did not suffer from glue ear also had the same reactions. If they did not, of course, then some causal association between the reaction and the disease condition could be inferred and investigated, with the hope of improving the treatment of the disease itself. (shrink)