<prompt> In total flea index true is -Average all Xenopsella cheopis per ratAverage number of all fleas of all species per ratAverage number of all fleas in a burrowAverage number of all fleas in all species of rats to per burrow  <response>: Total flea index: it is the average number of flea of all species per rat. Reference:Park;s textbook of preventive and social medicine,K.Park,23rd edition,page no:294 p 