- Sep 4, 2005
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Thanks anti-vaxxers
They certainly shoulder a bit of the blame...
NY just identified it as well.
CDC estimates that the vast majority of people are vaccinated against it (something like 95%), however, the time period in which a person was vaccinated could play a part.
For instance, if you received the polio vaccine(s) prior to the year 2000 in the US, a two-dose regimen of that was about 90% effective (it went up closer to 98% if you received additional boosters or got the IPV vaccines post-2000), and they only recommend the "lifetime booster option" for at-risk adults.
Polio has a scary "feature", which is that It's estimated that 95 to 99 percent of people who contract poliovirus are asymptomatic due to vaccination. This is known as subclinical polio. Even without symptoms, people infected with poliovirus can still spread the virus and cause infection in others.
The case in NY was in an unvaccinated person, however, the NBC article states that the samples they've detected in NY are linked to samples collected in the UK and Israel.
Which means that it's possible that a person (vaccinated prior to 2000 with a 2-dose oral polio vaccine) could've gone to either of those countries on the trip, came back, been asymptomatic, and started the chain from there. Even with a pre-2000, 2-dose oral regimen being 90% effective (and vaccinated people overwhelmingly being asymptomatic in those rare cases when they do catch it), it highlights how delicate the herd immunity concept is.
However, I would draw a distinction between an "anti-vaxxer", and a person who wasn't vaccinated as a small child (due to their parent not opting for it).
In my case, I had to figure out what vaccines I had by paying to get a titers score test for all "the big ones"...mainly out of curiosity at the time, because when I asked my mom what childhood vaccines I had, her answer was "there were a bunch, but I don't remember which ones".
It's quite possible that there are some people in their 30s/40s walking around today not knowing that they're unvaccinated against polio.
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