BS240 - Community (Herd) Immunity

Front

What is community (herd) immunity?

Back

Protection from infectious disease when critical immunization threshold has been met.

Front

What does it mean when immunity wanes over time?

Back

Memory cells decrease in numbers over time.

Front

In the context of herd immunity, what do the RED individuals represent?

Back

Infected individuals.

Front

What is the critical immunization threshold?

Back

The minimum proportion of the population that must be vaccinated to establish herd immunity.

Front

What is the role of memory cells in immunity?

Back

Memory cells help the immune system recognize and respond to pathogens it has encountered before.

Front

How does vaccination contribute to herd immunity?

Back

Vaccination reduces the number of susceptible individuals, helping to protect those who cannot be vaccinated.

Front

What is the significance of the 78% threshold for polio herd immunity?

Back

It indicates the percentage of the population that must be immune to prevent the spread of polio.

Front

What happens if the vaccination rate falls below the critical threshold?

Back

The risk of disease outbreaks increases as herd immunity is compromised.

Front

What is natural immunity?

Back

Immunity acquired through infection and recovery from a disease.

Front

How does herd immunity protect vulnerable populations?

Back

It reduces the overall amount of the virus in the community, lowering the chance of exposure for those who are vulnerable.