BIOLOGICAL CLASSIFICATION
VIRUSES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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because the virus mutates very quickly
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because the virus is unknown
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because the vaccine works for a short time
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none of the answers
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Detailed explanation-1: -Influenza is a constantly evolving virus, and immunity to a single strain through infection or vaccination does not necessarily protect against new strains that develop. We know from experience there is likely to be another flu pandemic, and we should be as well prepared as possible when it happens.
Detailed explanation-2: -Because flu viruses change so quickly, last year’s vaccine may not protect you from this year’s viruses. New flu vaccines are released every year to keep up with rapidly changing flu viruses.
Detailed explanation-3: -Why Does the Flu Fluctuate in Severity Year to Year? Since the flu is present year-round, spans the globe, and can spread between species of hosts, the virus has opportunities to mutate and change from year to year.