<prompt> Which is most dangerous for transmitting plague -Blocked fleaPaial blocked fleaBothUnblocked flea  <response>: plaque is primarily a zoonoses caused by Yersenia pestis. -The commonest and the most efficient vector of the plaque is rat flea, Xenopsylla cheopis. - a paially blocked flea is more dangerous than a completely blocked flea due to longer life span. Reference : Parks textbook of preventive and social medicine, 23rd edition, pg no:293 p 