COVID-19 vaccine third shot unintended effects on par with second dose: CDC research

Most further doses of mRNA COVID-19 vaccine administered about six months after the first collection resulted in mild-to-moderate unintended effects, in response to an preliminary evaluation launched Tuesday from the Facilities for Illness Management and Prevention (CDC). The research interval occurred when mRNA third dose eligibility was restricted to sufferers with moderate-to-severe immunocompromising circumstances.

Findings stemmed from knowledge collected between Aug. 12 to Sept. 19 by v-safe, the CDC’s voluntary phone-based surveillance system, and included 22,191 registrants who reported receiving a 3rd dose of vaccine.


Practically all registrants beneath research acquired a 3rd dose matching the first collection, and for 12,591 registrants who accomplished a check-in survey, 79.4% and 74.1% reported native or systemic reactions, respectively, after the third dose, versus 77.6% and 76.5%, respectively, after the second dose.

“These initial findings indicate no unexpected patterns of adverse reactions after an additional dose of COVID-19 vaccine; most of these adverse reactions were mild or moderate,” the report reads.


Throughout the board, v-safe knowledge indicated a slight enhance in native reactions after the third dose versus dose two, and a slight lower in systemic reactions after dose three versus dose two. Most reviews of ache after the extra dose have been characterised as mild-to-moderate reactions (51.4% and 41.9%) in comparison with 637 registrants (6.7%) who reported extreme ache, “defined as pain that makes daily activities difficult or impossible.”

Of the entire 22,191 third dose recipients, about 28% mentioned they couldn’t “perform normal daily activities” most regularly the day after vaccination, whereas 1.8% sought medical care and 0.1% have been hospitalized. The survey didn’t seize causes for medical consideration or hospitalization, nevertheless the report notes that CDC employees adopted up with these registrants.


Dr. Rochelle Walensky, director of the CDC, spoke to the findings throughout a White Home briefing Tuesday, including that the CDC and FDA reviewed the report in informing the newly launched suggestions for booster photographs, which awarded expanded eligibility for the Pfizer vaccine booster throughout a number of high-risk teams about six months after the first collection. Well being authorities are working to evaluate related knowledge for recipients of different vaccines developed by Moderna and J&J.

“COVID-19 vaccine booster doses so far are well tolerated,” Walensky mentioned of the report, partly, including, The frequency and type of side effects were similar to those seen after the second vaccine doses and were mostly mild or moderate and short-lived.”

“We will continue to evaluate data as it becomes available in real-time and with urgency and update our recommendations to make sure that all of those at risk have the protection they need,” Walensky mentioned.

Whereas third dose eligibility was restricted to a small fraction of Individuals with immunocompromising circumstances through the research interval, researchers suspected registrants included these with and with out such circumstances, and the v-safe surveillance system doesn’t embody knowledge about immune standing.

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