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.









