Epidemics of plague are mentioned in the holy books like BIBLE and BHAGAWAT PURANA. They were aware of the host factor i.e. the rat .Holly books advised that as soon as the dead rats are seen, the house should be vacated. Plague can occur as an Endemic and can burst into an Epidemic. It repapered in 1994.at BARODA as an Epidemic after a gap of 28 years.
- It is a gram –ve bacteria.
- They are present in the blood, spleen, bubos, and sputum in cases of pneumonic plague.