A decrease in the number of CD 4 + cells in HIV infection occurs as a result of:
> direct virus cytopathic effect
> syncytia formation
> apoptosis
> autoimmune reactions
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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