Monitoring resuscitation

this will generally be detectable within a few months afterwards by conventional testing for antibody."-ED,BMJ.Sudden infant death syndrome in Hong Kong SIR,-Dr Millard Bass, commenting on our paper on sudden infant death syndrome in Hong Kong,' wrongly asserted that the controls we used were unsuitable.2According to basic epidemiological principles, controls should not have the disease or condition under investigation but should be similar to cases in regard to past potential for exposure.We used one community control and one hospital control for each dead child, and we consider that neither group was subject to selection bias.The controls