Study of suspected plague cases for isolation and identification of Yersinia pestis.

A total of 62 suspected patients of plague were investigated for evidence of Yersinia pestis, by blood culture, lymph node aspirate culture, sputum culture, animal inoculation and serology for f1 antibodies against f1 antigen of Yersinia pestis. None of the samples was positive by direct smear examination and culture for Yersinia pestis, as well as for serology. The non positivity of the cultures is discussed.