منابع مشابه
Herd immunity and the herd severity effect.
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متن کاملHerd immunity: history, theory, practice.
Herd immunity has to do with the protection of populations from infection which is brought about by the presence of immune individuals. The concept has a special aura, in its implication of an extension of the protection imparted by an immunization program beyond vaccinated to unvaccinated individuals and in its apparent provision of a means to eliminate totally some infectious diseases. It is ...
متن کامل"Herd immunity": a rough guide.
The term "herd immunity" is widely used but carries a variety of meanings. Some authors use it to describe the proportion immune among individuals in a population. Others use it with reference to a particular threshold proportion of immune individuals that should lead to a decline in incidence of infection. Still others use it to refer to a pattern of immunity that should protect a population f...
متن کاملInducible Defence and Herd Immunity
Many organisms vary their level of investment in defensive characters. Protective traits may be induced upon exposure to predators or parasites. In a similar way, humans vaccinate in response to threatening epidemics. When most group members defend themselves, epidemics die out quickly because parasites cannot spread. A high level of group (herd) immunity is therefore beneficial to the group. T...
متن کاملEstablishing herd immunity against Ebola through vaccination.
OBJECTIVES In response to recent concern regarding Ebola outbreaks, this study aims to (1) determine the relationship between vaccination coverage and herd immunity, (2) determine the vaccination coverage necessary to establish herd immunity for previous Ebola viruses, and (3) recommend vaccination coverage thresholds for future Ebola viruses. METHODS Herd immunity thresholds needed to block ...
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ژورنال
عنوان ژورنال: The Lancet
سال: 2020
ISSN: 0140-6736
DOI: 10.1016/s0140-6736(20)32167-x