(Click the link to comment and to vote – voting not working through email, sorry!)
Well, it seems time to learn about measles again.
(Click the link to comment and to vote – voting not working through email, sorry!)
Well, it seems time to learn about measles again.
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March 5, 2025 at 10:23 pm
D) Population (aka “herd”) immunity requires a 90% or higher vaccination rate
Measles is a highly infectious airborne disease with a 90% attack rate and R0 of 12-18. Infectious respiratory droplets can remain airborne for up to 2 hours. Population (aka “herd”) immunity is not achieved unless vaccination rates in the community are 95% or higher. Numerous communities in the USA currently have vaccination rates < 95%, especially post-COVID pandemic. The incubation period ranges from 6 to 21 days, and individuals are contagious from 4-5 days before the rash appearance to 4 days afterward. One dose of the measles vaccine is 93% effective; two doses is 97% effective. The first dose is generally given at age 12-15 months; during an epidemic measles vaccine alone (not as an MMR) can be given to babies as young as 6 months.