# Polio has a basic reproduction number (R0) = 5. The vaccine is very good; in fact, polio vaccine is 99% effective when two follow up booster shots are given. What proportion of a population needs to be vaccinated in order for herd immunity to be effective?

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Asked Dec 3, 2019
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Polio has a basic reproduction number (R0) = 5. The vaccine is very good; in fact, polio vaccine is 99% effective when two follow up booster shots are given. What proportion of a population needs to be vaccinated in order for herd immunity to be effective?

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Step 1
• Herd immunity is an immunization approach to control the spread of infectious disease. It involves immunization of a large enough proportion of population to serve as barrier for protection of non-immune individuals.
• The herd immunity threshold (qc) can be calculated with the formula provided in the white board. It is the minimum percentage of immune individuals required to control the spread of a dise...

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