Travel prophylaxis

doi:10.1136/bmj.310.6978.533a

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R H Behrens,
J A Roberts

Consultant physician in tropical and travel medicine Hospital for Tropical Diseases Travel Clinic, London NW1 0PE
Senior lecturer Health Services Research Unit, London School of Hygiene and Tropical Medicine, London WC1T 7HT

EDITOR,—Pierre van Damme and colleagues and E Walker support the findings of our study that high risk travellers should be selectively immunised, but they disagree about other issues. The aim of our study was to provide a framework in which policy related to travel prophylaxis could be explored in the context of the NHS.1

While acknowledging that underreporting occurs, we used a correction factor of 50%. This factor includes adjustment for diseases with short incubation periods, such as malaria and typhoid, which may well present …