Infection risk rises 90 days after second dose of Pfizer’s anti-Covid vaccine: Study

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The risk of infection gradually increases 90 days after taking the second dose of Pfizer-BioNtech’s anti-Covid-19 vaccine. A new research has shown this fact.

A study conducted by Israel’s ‘Research Institute of Lumit Health Services’ found that immunity to vaccines tends to decline over time. Also, it emphasizes the need for a third dose (booster dose).

The anti-Covid-19 vaccination campaign was started on a large scale in Israel in December 2020, but from June 2021, cases of infection have started increasing once again.

Across the world, large-scale anti-Covid-19 vaccination campaigns are being conducted to prevent the spread of infection, but scientists believe that even in countries with high vaccination rates, the infection may be more spread, as vaccines may over time. immunity decreases.

Researchers reviewed ‘electronic health records’ for 80,057 adults aged 44, on average, who underwent PCR tests at least three weeks after their second dose and had no evidence of prior exposure to the coronavirus. Were.

Of these 80,057 participants, 7,973 (9.6 percent) were found infected. The reports of these people were then matched with those of the same age and ethnic group, who were tested in the same week and were not found to be infected.

After looking at other potentially influencing factors, the researchers found an increased risk of infection with the passage of time after the second dose. Compared with the initial 90 days after the second dose, the risk of infection in all age groups was 2.37 times higher after 90–119 days, 2.66 times higher after 120–149 days, 2.82 times higher after 150–179 days and and 180 days or higher was followed by 2.82 times.

The study concluded that individuals who were given two doses of the Pfizer vaccine showed reduced immunity over time.


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