GENERAL ANATOMY
IMMUNE SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Influenza strains that sweep around the world often carry names such as Shanghai H1N1 or Mexico City H2N2. The viruses vary in H and N surface proteins because
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the viruses reproduce and attack people in cities more often.
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these viruses emerged as stray DNA from the genomes of people in these cities.
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this is where the antibodies of immune people began to break down and the old virus was again virulent.
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when infected people develop immunity to the present virus, strains that mutate sufficiently to be outside the range of immunity are soon spread in highly populated areas.
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Explanation:
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