<prompt> True statement about plague is -Vaccine is not used to control epidemic of pneumonic plagueMost impoant measure to control epidemic rodent controlSepticemic plague is highly infectiousLive attenuated vaccines are used  <response>: - the most efficient method to prevent plaque is control of rat flea. -immunisation with plaque vaccine is a valuable preventive measure. The WHO recommends that under all circumstances, vaccination should be used only for the prevention not the control of human plaque. - killed plaque vaccine is used. Reference : Parks textbook of preventive and social medicine, 23rd edition pg no:296 p 