Health

Pfizer COVID-19 vaccine is effective from 11 days after the first dose

The findings, published as a preprint on the medRxiv * server, may help formulate policies due to delayed vaccine deployment in countries such as the United States and Canada. This could also be increased by efforts to distribute vaccines in developing countries where supply is scarce.

“The first dose of Pfizer COVID-19 vaccine helped develop a detectable neutralizing antibody prior to the second dose.”


In this study, the team reviewed Pfizer-BioNTech Phase III study data from days 1 to 111 in the placebo and experimental groups.

They also looked at data from Moderna’s vaccine trial. However, the number of Covid-19 cases in the Moderna trial was low in the first few weeks, so there was not enough data to evaluate. Instead, Moderna’s trial data was used for comparison with Pfizer’s trial data.

They studied the efficacy of vaccination from days 11 to 28 and compared the efficacy of a second dose of vaccination given between days 28 and 111.

Although the moderna sample size was limited, there was no significant difference in vaccine efficacy between 11 and 35 and 7 days after the second dose of vaccine compared to the Pfizer-BioNTech mRNA vaccine. ..

Source: IANS

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