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RE: A response to @chron: Why you should believe in Herd Immunity!

in #health • 7 years ago

You're assuming that once someone is vaccinated they have immunity to that particular pathogen, but that immunity decreases with time. You can have 100% of a population vaccinated, but half of them were vaccinated so long ago they no longer have immunity...hence only 50% coverage...hence there'd be no 'herd immunity' (a dubious concept). For example all those vaccinated with Varicella in the last 10 years, how many are still immune? Exactly... that's why they are talking about booster shots.

7 years ago in #health by
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     7 years ago (edited) 

    You're assuming that once someone is vaccinated they have immunity to that particular pathogen,

    Where exactly do I say that?

    but that immunity decreases with time.

    Really?

    For example all those vaccinated with Varicella in the last 10 years, how many are still immune?

    Probably a lot more than you think.

    "In Japanese studies, 97% of children had antibody 7 to 10 years after vaccination."
    "Immunity appears to be long-lasting, and is probably permanent in the majority of vaccinees."

    https://www.cdc.gov/vaccines/pubs/pinkbook/downloads/varicella.pdf