Herd Immunity Flashcards

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What is herd immunity?

When most people in a group are immune to a disease, so it struggles to spread.

There are fewer infected people around, so the disease is less likely to reach them.

Babies and people who cannot be vaccinated, such as those with weak immune systems.

The minimum percentage of the population that must be immune to stop the disease spreading.

The disease can spread again and cause outbreaks.

Each case infects more people, so a larger share must be immune to block the spread.

No. Herd immunity only helps with diseases that pass between people.

It makes many people immune without them having to catch the disease.

Yes, but it is risky because people may become very ill or die. Vaccines are safer.

Yes, if enough people stay immune and the disease only spreads between humans.