How many types of hemaglutinin antibodies are there for influenza?

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Multiple Choice

How many types of hemaglutinin antibodies are there for influenza?

Explanation:
Hemagglutinin is the main target of neutralizing antibodies against influenza, and its gene defines distinct antigenic subtypes. In influenza A, there are sixteen distinct hemagglutinin subtypes, labeled H1 through H16, each with unique surface features. Antibodies against one subtype generally don’t neutralize others because the epitopes differ enough between subtypes. This diversity is why vaccines and surveillance track multiple HA types, since the immune system recognizes and responds specifically to the particular HA it encounters. So, the number of HA types recognized in influenza A is sixteen.

Hemagglutinin is the main target of neutralizing antibodies against influenza, and its gene defines distinct antigenic subtypes. In influenza A, there are sixteen distinct hemagglutinin subtypes, labeled H1 through H16, each with unique surface features. Antibodies against one subtype generally don’t neutralize others because the epitopes differ enough between subtypes. This diversity is why vaccines and surveillance track multiple HA types, since the immune system recognizes and responds specifically to the particular HA it encounters. So, the number of HA types recognized in influenza A is sixteen.

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