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Pfizer and Moderna Vaccines May Prevent Infections, Not Just Symptoms, Study Finds


One study looked at the medium-term effectiveness of the Pfizer and Moderna vaccines in the United States.

According to US infectious disease specialists, the data suggests that Pfizer and Moderna’s COVID-19 vaccines prevent not only the symptoms of the SARS-CoV-2 virus, but also possible new infections.

A team from the prestigious Mayo Clinic institution examined more than 31,000 people in four states in the United States, who had received at least one of the two doses that make up the vaccination schedules in that country. This is how found that the inoculants were more than 80% effective in preventing infection 36 days after the first dose, on average.

At 15 days, efficacy was detected at 75%, and appeared to show 89% from 36 days after the second dose, as reported by publication scientific of Medrxiv, not yet peer reviewed.

The US has given authorization for emergency use to two vaccines against COVID-19, that of Pfizer and that of Moderna, which need to be stored at very low temperatures, so that a power cut can be fatal to time to preserve them.  EFE / EPA / ETIENNE LAURENT / Archive
The US has given authorization for emergency use to two vaccines against COVID-19, that of Pfizer and that of Moderna, which need to be stored at very low temperatures, so that a power cut can be fatal to time to preserve them. EFE / EPA / ETIENNE LAURENT / Archive

The vaccination campaign in the North American country was delayed by harsh winter weather that gripped much of the nation administered by Joe Biden. Despite the delay, authorities pushed to vaccinate Americans before what appear to be more communicable variants spread further and fears that they could reverse progress in terms of reducing cases and hospitalizations.

So far and according the British statistical tracker Our World In Data, more than 66.44 million doses of vaccines have been administered in the US. Out of 100 Americans, 20.08 have been inoculated against COVID-19 and the country is fourth in the world ranking of nations that inoculate the most against the pandemic disease.

For the doctor Christopher murray, director of the Institute for Health Metrics and Evaluation at the University of Washington, “America is unlikely to achieve herd immunity to the virus before winter. We know that COVID is really seasonal, so when next winter comes, we need to have a much higher level of protection to stop it on its way, “he told the CNN.

A box to keep the cold chain of Pfizer-BioNTech and Moderna COVID-19 vaccines is seen at the Spanish pharmaceutical distributor 'Bidafarma' Granada warehouse, amid the coronavirus disease (COVID-19) outbreak, in Santa Fe, near Granada, southern Spain February 1, 2021. REUTERS / Jon Nazca
A box to keep the cold chain of Pfizer-BioNTech and Moderna COVID-19 vaccines is seen at the Spanish pharmaceutical distributor ‘Bidafarma’ Granada warehouse, amid the coronavirus disease (COVID-19) outbreak, in Santa Fe, near Granada, southern Spain February 1, 2021. REUTERS / Jon Nazca

“Herd immunity does not take effect until 80% or more of the population has immunity, either through infection or vaccination. And the new variants can complicate the picture ”, analyzed Murray. “If people can be reinfected with the new variants, the pandemic can take off again.”

Although officials expect the vaccines to be widely distributed by the end of the summer, the president Joe Biden said on Friday that issues like weather, mutant strains and manufacturing delays make it difficult to pin down a schedule.. “I think we are on the way, I promise you. I know we will run into obstacles. It’s not going to be easy here until the end, but we are going to win, ”he declared while visiting a Pfizer facility in Michigan.

EFE / EPA / STEPHANIE LECOCQ / Archive
EFE / EPA / STEPHANIE LECOCQ / Archive

To accelerate the pace and availability of vaccination, it was learned last Thursday that Pfizer’s COVID-19 vaccines can be stored at the usual temperatures found in pharmaceutical freezers for a period of two weeks. This was specified by the United States Food and Drug Administration (FDA).

This authorization relaxes a previous requirement that required that the vaccines be stored at temperatures between -80 to -60 degrees ° C.

The announcement was made last Friday by the company, which stated that from now on vaccines could be stored at temperatures between -25 ° C and -15 ° C, the most common in pharmaceutical freezers and refrigerators.

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The United States Authorized Storage of Pfizer Vaccines at Normal Freezer Temperatures
Joe Biden celebrated the application of the first 50 million doses of the vaccine against COVID-19 in the United States
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