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What is the benefit of vaccines?

Updated: 8/16/2019
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11y ago

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To protect us from any adverse situation in reality, whenever a similar active virus or pathogen attacks our body.

Not only do vaccines prevent (or at least reduce the severity of) diseases, there is such a thing call "herd immunity" which is very important for large population. In any large population, there will be a segment which cannot get the vaccine, almost always due to having a weak immune system (the very elderly, very young, an those with an immunological disease or condition). By having everyone else around them vaccinated, that person is protected, as the disease will have no method of traveling through the population to get to those weak (and unprotected) individuals. Herd immunity also reduces the chance that a disease will re-emerge, as it reduces what is call the "reservoir" population (that is, those individuals who carry the disease but aren't affected by it, and from where subsequent outbreaks start). If everyone is immune, there is no reservoir for the disease to lurk in.

However, this Herd Immunity requires a very high level of vaccination - in most cases, well over 90% of all individuals must be vaccinated before the benefits kick in.

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