Over 100 children at the school are susceptible to virus.

  • tryptaminev 🇵🇸 🇺🇦 🇪🇺@feddit.de
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    9 months ago

    Is it 97% on the basis that herd immunization makes your exposure unlikely, so that you’d at best be exposed to a single person that could contract it to you?

    Or is it 97% on the basis that you are submerged in an atmosphere full of people sick from measles?

    WHO information on these numbers

    So either it refers to a clinical trial with a defined exposure, or it referes to empircal data that is based on the conditions in the real world, which critically includes the herd immunity.

    Herd immunity is a critical factor and it works exponentially. E.g. from 100% to 95% is less of an issue than from 95% to 90% The critical point for measles is at around 92% to prevent exponential infections. This included the risk for people who are vaccinated

    Measles are among the most contagious diseases. To interpret the graph. Because of the high R rate w.o. immunization, you need 92% immunization rates to have one measle case cause another measle case, e.g. reproduction = 1. You go below and it goes exponential.

    Wikipedia - Herd immunity