Herd immunity only occurs in a population in which all individuals are immune. occurs in a population in which a large percentage of the population is immune. only provides protection to those that are already immune. is responsible for dramatic increases in childhood diseases. occurs in a population in which a large percentage of the population is immune AND is responsible for dramatic increases in childhood diseases.
Added by Joel B.
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Step 1: Herd immunity occurs when a large portion of a community is immune to a particular disease. Show more…
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Q6.2. There are many diseases that do not infect a person more than once, such as chicken pox and measles. What is responsible for this lifetime immunity? The innate immune response, because barriers to entering the body improve with age. The innate immune response, because adults have more white blood cells than children. The acquired immune response, because antibodies are developed from previous infections. The acquired immune response, because it responds rapidly to broad classes of pathogens.
Nicholas M.
Vaccines don't provide immunity from disease for some people. But if most people get vaccinated against a disease, such as measles, then the population achieves "herd immunity," which means that there are so few cases of the disease that even people for whom vaccinations are ineffective are unlikely to contract the disease. An article in the Economist magazine argues that, "herd immunity is a classic public good." This statement is A. not true, because not everyone can consume herd immunity whether or not they pay for it. B. true, because immunity is nonexcludable, and everyone can simultaneously enjoy the? "herd immunity." C. true, because a person receives some immunity from the disease by being vaccinated, even if other people are not vaccinated. D. not true, because immunity is nonexcludable, but in order for it to occur there must be a herd, and there is no guarantee that enough people will get vaccinated.
Keemin L.
Which is an example of passive immunity? (A) Lifelong immunity. (B) Babies who are nursing receive antibodies from their mothers. (C) You become resistant to a viral infection once you have recovered from it. (D) You become resistant to mumps after receiving the mumps (E) People who have AIDS have antibodies against the virus but are still gravely ill.
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The Human Immune System
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