Figures in study were incorrect

EDITOR,—Debate about the role of immunoprophylaxis for travellers is to be encouraged, but health care planners should not be lulled into complacency by R H Behrens and J A Roberts's conclusion that vaccination against typhoid and hepatitis A is not cost effective for society or the person concerned.1 No such study should group all countries outside Europe, North America, and Australasia into the same category of risk regardless of the …