What is herd immunity?
Herd immunity is when a large portion of a population becomes immune to a disease, making its spread unlikely.
How is herd immunity achieved?
It can be achieved through vaccination or previous infections, which helps protect those who are not immune.
Why is herd immunity important?
It's crucial for protecting vulnerable populations who cannot be vaccinated, like infants or those with certain health conditions.
What percentage of the population needs to be immune for herd immunity?
The percentage varies by disease; for example, about 95% immunity is needed for measles.
Can herd immunity be lost?
Yes, if vaccination rates drop or if the virus mutates, herd immunity can weaken.
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