Two researchers urged governments to postpone vaccination with the second dose of the Pfizer vaccine against Covid-19 disease, which they say has a rate of 92.6 percent of its effectiveness after the first dose.
The two researchers, Danuta Skuronsky and Gaston de Serres, said they reached that conclusion based on documents that Pfizer provided to the US Food and Drug Administration.
And they mentioned in a letter published in the “New England” medical journal that these results are similar to those related to the vaccine produced by “Moderna”, and its effectiveness rate after the first dose was 92.1 percent.
And he warned that there may be uncertainty about the duration of protection guaranteed by one dose, but vaccination with the second dose a month after the first “does not provide much benefit in the short term.”
They said: “Given the current shortage of vaccines, postponing the second dose is a matter of national security, if ignored, it will definitely lead to thousands of hospitalizations and deaths due to Covid-19 this winter in the United States.”
In response, Pfizer said that a change in the two-dose vaccination regimen has not yet been evaluated, adding that this decision is left to the health authorities.