< BACK NEXT > 4 of 8 - Herd immunity and freeloading
Herd immunity is important because there are number of people who cannot be vaccinated for health or age reasons - herd immunity effecting an indirect and statistically safe space for them.

If additionally, a small number of people choose to not vaccinate for ideological reasons - freeloaders - they too are proteced by herd immunity.

In this and successive scenarios solid red represents those who cannot be vaccinated for health or age reasons and outline red represents freeloaders.

Both groups are susceptible to infection.

This scenario shows that a small number of freeloaders does not affect herd immunity.

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