Suspected cases of pulmonary tuberculosis referred from port of entry into Great Britain, 1980-3 Most people arriving in Great Britain from the Third World do so at Heathrow Airport, London. All potential imunigrants and a proportion of visitors are referred to the health control unit, where a general medical examination is carried out. In many cases a miniature chest radiograph is taken; if pulmonary tuberculosis is suspected the subjects are referred for inpatient assessment.' About 70% ofthese patients are admitted to the Lister
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