A disease in human beings caused by a virus is _______. (a) Typhoid (b) Influenza (c) Dysentery (d) Cholera

Influenza

Influenza is a viral infection while diphtheria, cholera and typhoid are all bacterial infections because of Corynebacterium diphtheriae, Vibrio cholerae and Salmonella typhi respectively. There are four types of influenza viruses: A, B, C and D. Human influenza A and B viruses cause seasonal epidemics of disease.

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