THE CELL
CELL COMMUNICATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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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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Detailed explanation-1: -Antigenic drift is the reason for the incorporation of one or more new strains in each year’s influenza vaccine. It is also the basis for the recommendation of yearly influenza vaccination.
Detailed explanation-2: -H1N1 flu is a subtype of influenza A. Subtypes of influenza A are categorized based on two proteins on the surface of the virus, hemagglutinin (H) and neuraminidase (N). There are many H and N subtypes, and each one is numbered. All H and N flu subtypes are influenza A viruses.
Detailed explanation-3: -The designation “H1N1” indicates unique traits, which exhibit characteristics that identify the virus to the immune system and allows for attachment and replication of the virus. The “H” (hemagglutinin) and the “N” (neuraminidases) are both proteins that are found on the outer shell or envelope of the virus.
Detailed explanation-4: -However, (H1N1)pdm09 virus continues to circulate as a seasonal flu virus, and cause illness, hospitalization, and deaths worldwide every year.