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[typhoid fever in north lebanon: a 8-year study (1992-1999) using the widal test].we evaluated the frequency of typhoid fever in north lebanon over an 8-year period (1992-1999) in patients admitted with fever to the islami de bienfaisance hospital in tripoli. we analysed 7391 serum samples for salmonella typhi infection using the widal and felix tests. the cut-off value for infection was an agglutinin o titre > or = 1/160 (a value validated in an earlier study in the same region). of the 7391 samples, 1131 (15.3%) had an agglutinin o titre > or = 1/160. the 8-year surveillanc ...200416201725
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