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Single dose of Pfizer Covid-19 vaccine may protect against asymptomatic infection, preprint study says

February 26, 2021. Summarized by summa-bot.

Compression ratio: 21.2%. 2 min read.

A healthcare worker administers a dose of the Pfizer-BioNTech Covid-19 vaccine at Coors Field in Denver, Colorado, U.S., on Saturday, Feb. 20, 2021. More than 1 million doses of Covid-19 vaccines have been administered to Coloradans to date as public health officials are nearing their goal of inoculating 70% of all people 70 and older, state representatives said Thursday. Photographer: Chet Strange/Bloomberg

More new research suggests a single dose of the Pfizer/BioNTech coronavirus vaccine can protect against asymptomatic coronavirus infection, which could help reduce transmission of the virus.

More new research suggests a single dose of the Pfizer/BioNTech coronavirus vaccine can protect against asymptomatic coronavirus infection, which could help reduce transmission of the virus.

Researchers used PCR tests to screen for coronavirus in vaccinated and non-vaccinated Cambridge University Hospitals health care workers who reported to work feeling well.

Unvaccinated health care workers were positive for coronavirus in 0. 80% of tests; vaccinated health care workers less than 12 days from a single dose were positive in 0. 37% of tests; and vaccinated health care workers who were at least 12 days out from one dose were positive in 0. 20% of tests.

A large study released this week by Public Health England (PHE) found that one dose of the Pfizer vaccine “provides high levels of protection against infection and symptomatic disease,” reducing the risk of infection by 72% after three weeks, while two vaccine doses reduced the risk of infection by 85%.

To understand how these factors may play into the future timeline of the pandemic, CNN spoke with five experts: Dr. Arturo Casadevall, chair of molecular microbiology and immunology at Johns Hopkins University; Justin Lessler, associate professor of epidemiology at Johns Hopkins University; Jessica Malaty Rivera, science communications lead at the COVID Tracking Project; Dr. Aneesh Mehta, of the Emory Vaccine Center; and Dr. Christopher Murray, director of the Institute for Health Metrics and Evaluation.

Two fully vaccinated people can gather individually with minimal risk, Dr. Anthony Fauci told CNN’s Chris Cuomo Thursday.

Germany has inoculated 5. 7 million people with the first shot of the coronavirus vaccine -- 4. 5% of the country’s population -- and more than 2% have received the second shot, Spahn said.

By the end of next week 11 million coronavirus vaccines will have been distributed across Germany's 16 federal states, Spahn said Friday.

India has supplied more than 36 million doses of coronavirus vaccines to various countries, of which 6. 75 million doses have been provided as grant assistance, a spokesperson for the Ministry of External Affairs (MEA) said at a press briefing Thursday.

India is the world's biggest vaccine manufacturer and has pledged to donate millions of doses to neighboring countries.

India has also offered locally-made vaccines to all members of the diplomatic corps (foreign missions) and their families based in the country, said Srivastava.

"It is obviously difficult for people if they've never had a vaccine; they ought to think about other people rather than themselves," she said in a video call with health officials leading the Covid-19 vaccine rollout in the United Kingdom.

Nearly 19 million people in the UK have received at least one dose of the vaccine, in one of the world's fastest rollouts.

More than half of Americans said they have already gotten at least one dose of the Covid-19 vaccine or want to get vaccinated as soon as possible, the Kaiser Family Foundation reported Friday.

In light of the anticipated US Food and Drug Administration emergency use authorization for the Johnson & Johnson Covid-19 single shot vaccine, the poll found that about a quarter of individuals who wish to “wait and see” before being inoculated said they would be more likely to get a vaccine that requires only one dose.

by summa-bot

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