In the Spring of 2009, a novel H1N1 virus emerged that had a new combination of genes from pigs, humans, and birds. As a result, the virus spread quickly, resulting in a swine flu pandemic. Which of the following concepts explains why the outbreak occurred? In the Spring of 2009, a novel H1N1 virus emerged that had a new combination of genes from pigs, humans, and birds. As a result, the virus spread quickly, resulting in a swine flu pandemic. Which of the following concepts explains why the outbreak occurred?
Narrow tropism
Antigenic drift
Antigenic shift
Attenuation
H1N1 virus that has combination of genes from pigs, humans and birds is more dangerous and more diverse than original one so it is antigenic shift which change genome of this virus so much.
3rd one is correct answer.
In the Spring of 2009, a novel H1N1 virus emerged that had a new combination of...
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