Question:easy
The recent (2009) influenza pandemic was caused by which strain?
The recent (2009) influenza pandemic was caused by which strain?
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Think swine flu, 2009, the same H and N numbers as the 1918 Spanish flu.
Updated On: Jun 23, 2026
- H1N1
- H5N1
- H7N7
- H3N2
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The Correct Option is A
Solution and Explanation
Pandemic timeline pearl:
1918 Spanish flu: H1N1.
1957 Asian flu: H2N2.
1968 Hong Kong flu: H3N2.
2009 swine flu: H1N1 again.
Apply it: The recent pandemic the question refers to is the 2009 swine flu, caused by a new H1N1 strain. So H1N1 is the answer.
Eliminate: H5N1 is avian flu with high case-fatality but only sporadic human outbreaks, not a true pandemic. H7N7 is another avian subtype of limited human impact. H3N2 belongs to the 1968 pandemic, not the recent one.
Answer: H1N1. Ref: Park PSM; WHO influenza data.
1918 Spanish flu: H1N1.
1957 Asian flu: H2N2.
1968 Hong Kong flu: H3N2.
2009 swine flu: H1N1 again.
Apply it: The recent pandemic the question refers to is the 2009 swine flu, caused by a new H1N1 strain. So H1N1 is the answer.
Eliminate: H5N1 is avian flu with high case-fatality but only sporadic human outbreaks, not a true pandemic. H7N7 is another avian subtype of limited human impact. H3N2 belongs to the 1968 pandemic, not the recent one.
Answer: H1N1. Ref: Park PSM; WHO influenza data.
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