<prompt> Plague is transmitted by the bite ofRat fleaCulex mosquitoBody louseTse-Tse fly  <response>: Plague, also called Black death or Mahamari or The great death, is a zoonoses caused by yersinia pestis.Wild rodent Tetra indica is the natural reservoir in India. o Most effective and commonest vector for plague is rat flea.Xenopsylla cheopis is the most important species of rat flea for plague. Other important species are X. astia, X. brasiliensis and Pulex irritans. Both sexes of flea bite and transmit the disease.A partially blocked flea a flea with partially blocked proventriculus is more dangerous than a completely blocked flea.Rat flea can survive upto 4 years in rat burrows under optimum conditions.This is considered the most likely mechanism of maintaining the natural focus.Modes of transmission may be :Bite of infected fleaDirect contact with tissues of infected animalDroplet infection in pneumonic plague,There are three types of plague :Bubonic plague most common type with incubation period 2-7 daysPneumonic plague most virulent and least common with incubation period 1-3 daysSepticemic plague less infectious with incubation period 2-7 days.Streptomycin is the drug of choice for treatment and tetracycline is the drug of choice for chemoprophylaxis. 