Health
COVID-19 vaccine provides strong protection against reinfection
COVID-19 vaccination provides lasting protection against reinfection, according to two studies published Wednesday. New England Journal of Medicine..
of One studyTake Pfizer at least once vaccination After recovering from COVID-19, the risk of reinfection was significantly reduced. Vaccine efficacy was 82% for ages 16-64 and 60% for ages 65 and older.
Data collected during the surge in Delta variant In Israel, “we support public health policies to vaccinate patients who have recovered from COVID-19, especially where delta mutations are still a concern,” the study authors write.
Researchers at Clalit Health Services in Tel Aviv, Israel, found that more than 83,000 people who received at least one Pfizer vaccine after recovering from a previous coronavirus infection and nearly 66,000 unvaccinated people who had previously recovered. I analyzed the electronic health record. infection.
Reinfection occurred in 354 (approximately 0.4%) of the 83,356 vaccinated participants and 2,168 (3.3%) of the 65,676 unvaccinated participants.
At age 65 and older, reinfection occurred in 28 of 9,384 (about 0.3%) vaccinated participants and 48 of 4,799 unvaccinated (1%). Differences in older groups may mean that older COVID-19 survivors may take more precautions against reinfection after recovery from the initial infection, the study said. The author writes.
Another analysis found that the effectiveness of the vaccine against reinfection was about the same for those who received one vaccine and those who received two doses after infection.
“Given previous exposure to the virus, primary vaccination in recovered patients appears to have provided a stronger and longer immunogenic response than the first dose alone in patients without previous COVID-19.” The research author wrote.
In Other studiesResearchers at the UK Health and Safety Agency have evaluated the efficacy and duration of COVID-19 vaccination among UK healthcare workers, including previously infected individuals.They were tested for infection every two weeks and every month Antibody test..
The research team investigated infections in unvaccinated participants and those who had been vaccinated with Pfizer or AstraZeneca-Oxford University up to 10 months ago.
Of the 35,768 participants, 27% recovered from COVID-19 and had antibodies. About 95% received two vaccinations, 87% received the Pfizer vaccine, and 8% received the AstraZeneca vaccine.
Between December 2020 and September 2021, the group experienced 2,747 initial infections and 210 reinfections. Vaccine efficacy in people who had never been infected in the Pfizer group was 85% 2-10 weeks after the second dose, but dropped to 51% about 6 months later. In particular, the decline in protection occurred during the surge in delta mutations in the United Kingdom, the study authors wrote.
In AstraZeneca’s recipients, vaccine efficacy was approximately 58% 2-10 weeks after the second dose, but did not decrease significantly over the long term. In unvaccinated participants, adaptive immunity decreased after one year.
At the same time, vaccine efficacy remained above 90% for those who were vaccinated after infection, even for those who were infected more than 18 months ago.
“Strategic use of additional immune doses of vaccines to avoid diminished defenses (especially in double-vaccinated, previously infected individuals) is the infection and infection in the ongoing response to COVID-19. May be reduced, “the research authors conclude.
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Sources 2/ https://www.webmd.com/vaccines/covid-19-vaccine/news/20220218/covid-19-vaccines-offer-strong-protection-against-reinfection The mention sources can contact us to remove/changing this article |
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