Lack of antibodies to the causative agent of HIV infection:
b) naturally
for the seronegative period of infection ;
c)
it is observed at a terminal stage AIDS .
Vibrio genus involves many species, only some serotypes of V.cholerae are pathogens of cholera. Which of the following causative agents of cholera?
V.cholerae serogroups non O1 and non O139
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