<prompt> Most common causative organism of acute pyelonephritis in pregnancy is?E.coliKlebsiella pneumoniaEnterobacterStaphylococcus group  <response>: ANSWER: A E.coliREF: Duttas textbook of obstetrics 6th ed page 296Incidence of pyelonephritis in pregnancy 1-3Previous history of urinary tract infection increases chance by 50Organisms associated are: E:coli 70, Klebsiella 10, Enterobacter, Proteus pseudomonas, Staphylococcus aureus 