An otherwise healthy patient who has just received a prosthetic aortic valve develops postoperative fever. Blood cultures are done and she is placed on broad-spectrum antibiotics. Two days later she is still febrile and clinically deteriorating. Which of the following organisms is the most probable etiologic agent?
ANocardia asteroides
BActinomyces israelii
CHistoplasma capsulatum
DCandida albicans
What is the therapy of choice for pseudomembranous enterocolitis?
APenicillin
BAmpicillin
CErythromycin
DVancomycin
Cholera is caused by?
AEnterococcus
BE.coli
CVibrio cholerae O1
DVibrio parahemolyticus
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