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Observations on commensal rats and their status to plague in Bombay.

The distribution pattern of various types of commensal rodents in Bombay city reveals that Bandicota bengalensis constitutes the predominant commensal rodent species followed by R. rattus and Rattus norvegicus. Apart from these three types, Bandicota indica, M. musculus and an insectivore (Suncus murinus) are the three species of commensal small mammals that are frequently encountered in or near human habitations. These small mammals are prevalent throughout the year and their percentage distribution varies very little during different months of the year. None of the rodent species examined during the years 1976-85 revealed presence of Y. pestis infection by bacteriological or serological methods. From these findings, it could be concluded that in the city of Bombay a focus of zoonotic plague infection does not exist.