Question

1. the currently circulating avian influenza virus causing outbreaks in southeast asia is subtype

a○h1n1
b○h3n2
c○h5n1
d○h7n2

Explanation:

H5N1 is a well - known avian influenza virus subtype that has caused outbreaks in Southeast Asia. H1N1 is a human - swine influenza virus, H3N2 is a human influenza virus subtype, and H7N2 is less commonly associated with large - scale Southeast Asian avian influenza outbreaks.

Answer:

C. H5N1