Herd immunity fails if at least what percentage of a population is unvaccinated?
A. 10%
B. 1%
C. 5%
D. 20%
2.
Which of the following statements about HIV is false?
A.
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HIV attacks mast cells. |
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B.
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PLEASE HELP ASAP
Ans. 1. Option C is the correct answer.
Explanation:- Herd immunity fails if at least 5% of populationis unvaccinated . So to maintenance the herd immunity, we have to vaccinate about 90- 95% herd population.
Ans.2. Option A is the correct answer.
Explanation:- HIV cells does not attack the mast cell. They attack the helper T cells . Especially CD 4 cells are attacked.
Herd immunity fails if at least what percentage of a population is unvaccinated? A. 10% B. 1% C. ...
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