Abstract
Plague is a zoonosis caused by the Gram-negative bacillus, Yersinia pestis, a member of the Enterobacteriaceae family. Madagascar, the Democratic Republic of Congo and Peru are still considered highly endemic for plague; however, the bacterium also exists in some regions in Asia and the USA. First symptoms occur 1 to 7 days after exposure. There are three clinical forms of plague: bubonic, pneumonic, and septicemic plague. Transmitted as an aerosol, Y. pestis has been developed as a biological weapon. There are adjuvanted whole-cell vaccines which need repeated dosing, and which are highly reactogenic; subunit vaccines are in development.
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