Reply to Only ~14% Of U.S. Adults Have Gotten Latest Covid-19 Vaccine Update

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Reply to "Only ~14% Of U.S. Adults Have Gotten Latest Covid-19 Vaccine Update"

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[quote=Anonymous][quote=Anonymous][quote=Anonymous]Shirley there is other data than just the CDC phone survey? I mean most people are getting shots at Walgreens, CVS, etc. I’m sure they have some data.[/quote]
There should be data on actual covid vaccinations as you describe, but none is being cited in the news. The CDC cites the NIS phone survey for vaccination shares and the press reports it. Of note, the CDC acknowledges that the NIS phone survey may inflate the reported share of people taking the new covid vaccine.

https://www.cdc.gov/respiratory-viruses/whats-new/vaccine-equity.html
"The main source of this data changed from previous years. During the COVID-19 Public Health Emergency (PHE), CDC tracked nearly all COVID-19 vaccines administered. The end of the PHE, however, limited the completeness of COVID-19 vaccine administration data CDC receives. Instead, CDC now primarily tracks who has gotten updated COVID-19 vaccines using a large national survey called the National Immunization Survey (NIS), which is a family of surveys that the agency uses to track uptake of other vaccines, like childhood, adolescent and flu vaccines. These estimates are based on survey responses rather than vaccine records, or administrations. [b]The NIS may overestimate the proportion of people vaccinated. [/b]For example, COVID-19 NIS data last year was consistently a few percentage points higher than the vaccine administration data CDC received directly from the states. Although we can’t directly compare this year’s survey data to last year’s number of vaccines given, NIS data allows for comparisons across groups and with NIS survey data from the previous year." [/quote]
PP again. To see how much the NIS phone survey may be overstating the uptake of the latest covid vaccine, it is interesting to look at historical data. In November and December 2022, the NIS survey estimated that the adult uptake of the bivalent booster was six to seven percentage points higher than what actually occurred. This type of overstatement is not surprising as self-reported surveys are subject to bias and there was social pressure to report vaccination. If the late 2022 difference between NIS and actual is continuing, then instead of the NIS survey's estimate that 14% of adults had taken the latest covid vaccine, it may actually have been only 7% or 8% percent of adults. That is not a trivial difference and shows the risk of using phone surveys to proxy actual vaccination data.

Nov 2022:  NIS survey 21% bivalent uptake for adults, Actual CDC data 15%; Dec 2022: NIS survey 25% bivalent uptake for adults, Actual CDC data 18%
NIS Survey Data Nov-Dec 2022, Table 2  https://www.cdc.gov/mmwr/volumes/72/wr/pdfs/mm7207a5-H.pdf 
End Nov 2022 actual vax data https://web.archive.org/web/20221205002436/https://covid.cdc.gov/covid-data-tracker/#vaccinations_vacc-people-booster-percent-pop5
End Dec 2022 actual vax data https://web.archive.org/web/20230109000217/https://covid.cdc.gov/covid-data-tracker/#vaccinations_vacc-people-booster-percent-pop5

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