I guessed at some of the offices to tag them and fit them into a single Tweet. She didn’t get them all quite right. 2/
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What does she think all these offices do? Does
@marwilliamson not realize that there’s already exist multiple complementary and overlapping systems monitoring vaccine safety? 3/Show this thread -
First there’s the Vaccine Adverse Event Reporting System (VAERS). It’s a passive reporting system that serves as an early warning system, a “canary in the coal mine,” if you will. 4/
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Antivaxxers love to hate on VAERS because it’s a passive reporting system, which leads them to claim that serious vaccines injuries are vastly underreported. 5/
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They might have a point if VAERS were the only system in place to monitor vaccine safety, given that passive reporting systems do tent to underestimate AEs. (It’s not. More on that in a moment.) 6/
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Of course, antivaxxers also love to point to VAERS to make all sorts of ludicrous claims about vaccines having caused deaths, autism, etc. Here’s the thing. Anyone can report anything to VAERS. A VAERS report does NOT indicate causation. 7/
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Also, antivaxxers and their attorneys have tainted VAERS with a lot of claims that vaccines caused autism, making it basically useless as anything other than a hypothesis-generating database. 8/https://respectfulinsolence.com/2008/01/18/how-vaccine-litigation-distorts-the-vaer/ …
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Let’s just put it this way. If you’re not by a car after receiving a vaccine, that doesn’t mean the vaccine was responsible. 9/
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The CDC runs two other databases, both active reporting systems, meaning that the system actively looks for adverse events after vaccination. One is the Vaccine Safety Datalink (VSD). 10/ https://www.cdc.gov/vaccinesafety/ensuringsafety/monitoring/vsd/index.html …
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VSD is a collaborative project between CDC’s Immunization Safety Office and 8 health care organizations started in 1990. It’s used to research hypotheses coming from VAERS. 11/ https://www.cdc.gov/vaccinesafety/ensuringsafety/monitoring/vsd/index.html …
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Then there’s the Clinical Immunization Safety Assessment (CISA), also run by the CDC. It was established in 2001 to address the unmet vaccine safety clinical research needs, partnered with several academic medical centers and
@kpnorcal. 12/ https://www.cdc.gov/vaccinesafety/ensuringsafety/monitoring/cisa/index.html …Show this thread -
Finally, the FDA runs the Post-licensure Rapid Immunization Safety Monitoring System (PRISM) out of
@FDACBER in collaboration with partners in the health care and medical insurance communities by analyzing health insurance claims. 13/Show this thread -
PRISM is a "a powerful, computer-based system that separates critical bits of information from vast streams of health care data in order to investigate adverse events and determine if there is a connection to a specific vaccine." 14/ https://www.pharmacist.com/article/prism-identifies-vaccine-safety-issues …
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Oops. Prematurely hit the “Tweet button.”
In any event, the FDA used PRISM to identify a link between a rotavirus vaccine and an increased risk of intussusception in infants. 15/Show this thread -
So, to conclude,
@marwilliamson, like all antivaxxers, is utterly clueless about the multiple systems already in existence, one passive, and three active surveillance systems, to monitor vaccine safety in the US, and she just demonstrated it again. 16/16Show this thread
End of conversation
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