Repeaters count: a sentinel method for asthma outbreaks. Barcelona Soybean-Asthma Group.

Abstract

Soybean unloading at the harbour of Barcelona released soybean dust and produced a small cluster of emergency room visits for asthma in patients formerly affected by soybean asthma epidemics. It is suggested that counting repeaters could provide the basis for a systematic epidemiological surveillance of sensitised populations.