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What is Virus which has more than one serotypes ? and explain in detail?
Ans. is 'd' i.e., Influenza Influenza virus is an enveloped RNA virus containing 8 pieces (8 segments) of single stranded RNA. There are three viral subtypes : (i) Type A (causes all pandemics and most epidemics); (ii) Type B; and (iii) Type C (not circulating currently).