Scientists from Penn State found that protection against symptomatic COVID-19 begins to decrease after one month from initial vaccination, while immunity against severe COVID-19 remains high for about six months.
The research was conducted by Dr. Catharine Paules et al.
According to the Centers for Disease Control and Prevention, more than 577 million doses of the COVID-19 vaccine have been administered across the nation.
Vaccinated people may wonder how long the vaccine provides protection against the coronavirus.
In the study, the team analyzed data from 7 million unvaccinated and vaccinated individuals from 18 peer-reviewed studies published from December 2019 to November 2021.
The vaccinated people received Pfizer-BioNTech, Moderna or Johnson & Johnson doses of the COVID-19 vaccine.
The team found the vaccines provided significant protection against COVID-19, but effectiveness waned over time.
The findings showed that after full vaccination, immunity against COVID-19 infection decreased from 83% after the first month to 22% after five or more months.
The research included data on adults and children, aged 12 and older. The findings showed that recipients of the Moderna vaccine experienced the highest levels of protection.
Fully vaccinated individuals are defined as those who received two doses of either the Moderna or Pfizer vaccines, as well as individuals who received one dose of the Johnson & Johnson vaccine.
The researchers did not have data beyond six months, and the study did not include data on booster vaccines.
The team says that vaccines remained 90% effective against severe COVID for up to six months.
However, protection against severe COVID-19 was lower (74%) for individuals who received the Johnson & Johnson vaccine.
According to the study, immunity against COVID-19 decreased more rapidly for individuals 65 or older regardless of which vaccine they received.
The researchers noted that overall efficacy could depend on several factors, including vaccine type, patient age, emerging variants and geographic areas.
According to the CDC, subsequent doses of the vaccine are recommended as time passes to help boost immunity and mitigate the threat of COVID-19.
Evidence shows that booster doses can provide a short-term increase in protection against COVID-19 infection and symptomatic disease.
If you care about COVID, please read studies about drugs that may reduce COVID-19 vaccine effectiveness, and drugs that could help treat COVID-19.
For more information about Covid, please see recent studies about two paths toward ‘super immunity’ to COVID-19, and results showing that CBD from cannabis may inhibit COVID-19 infection.
Copyright © 2022 Knowridge Science Report. All rights reserved.
