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Protection from infectious disease that occurs when a sufficient fraction of a population has become immune (through vaccination or previous infections)
Health authorities say the country has lost herdimmunity against the disease.
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Second, vaccination would likely elicit herdimmunity, which would benefit all ages.
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And that's one of the huge problems of attaining herdimmunity naturally.
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Normally herdimmunity is achieved by vaccinating people, not through deliberate infection.
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And hopes of a natural ' herdimmunity' forming among survivors may be fading.
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At the time, California's vaccination rates were below the 94 percent threshold needed to establish communityimmunity for measles.
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A much better term is " communityimmunity".
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Call it communityimmunity.
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It is crucially important that high levels of populationimmunity are maintained against polio in the foreseeable future.
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The level of populationimmunity to the lineage of Zika in Asia remains unknown, according to the World Health Organization.
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Such an event is a potential global health concern because of the waning populationimmunity to H2 hemagglutinin (HA).
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AM: First of all can I just say that it's actually a very complex inter relationship between the vectors, temperature, climate, and populationimmunities.
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Our findings suggest a transmissible RNA pathway, playing a role in socialimmunity and signaling between members of the hive.
Usage of herd effect in English
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However, the herdeffect (HE) depends both on the HPV type and the vaccination strategy.