Study: Covid Risk May Increase After A Second Vax Dose

Study: Covid risk may increase after a second vax dose

Jerusalem, Nov 26 : .A new study by a team of researchers has shown that there is a gradual increase of Covid-19 infection risk following the second vaccine dose.
The study was published in The BMJ journal.It showed a gradual increase of Covid-19 infections after 90 days of receiving a second dose Pfizer-BioNTech vaccine.

 Study: Covid Risk May Increase After A Second Vax Dose-TeluguStop.com

Ariel Israel, Leumit Health Services, Tel Aviv (Israel), said that although the Pfizer BioNTech vaccine provided excellent protection for the first few weeks, the findings suggest that some people may experience a decrease in protection over time.

The study involved the examination of electronic health records of 80,057 adults (average age 44) who had received a PCR test within three weeks of their second injection.There was no evidence of Covid-19 infection.

7.973 (or 9.6%) of the 80,057 participants had a positive test result.These individuals were then matched with negative controls of the same ethnicity and age who were tested in one week.

The time since the second dose was administered increased the rate of positive results.For example, among all age groups, 1.3% of participants tested positive 21-89 day after a second dose.However, this rose to 2.4% after 90-119 days; 4.6% after 120-149 days, 10.3% after 150-179 days, and 15.5 percent after 180 days.

After taking into account other factors, researchers discovered a significantly higher risk of infection when time has passed since the second dose.

The risk of infection was 2.37-fold greater after 90-119 days than it was after the second dose; 2.66-fold more after 120-149 day; 2.82-fold higher following 150-179 day; 2.822-fold higher thereafter; and 2.82-fold greater after 180 days or longer.

Researchers concluded that individuals who received two doses Pfizer-BioNTech vaccine had lower protection over time and that the risk of breakthrough infections increased with each subsequent dose.This was in contrast to the protection given during the initial 90 days.

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