Avian influenza is further classified on the basis of different hemagglutinin (H) and neuraminidase (N) proteins. Common subtypes include H5N1, H7N9, H9N2 . Which of the following subtypes of Avian Influenza has raised concerns about a possible global pandemic ?

(a) H1N1

(b) H5N1

(c) H3N2

(d) H7N9

Ans.(b)

Sol. The H5N1 subtype of Avian Influenza has raised concerns due to its high pathogenicity and potential for causing a global pandemic if it acquires the ability for sustained human-to-human transmission.

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