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New York Times

Track Covid-19 in your area, and get the latest state and county data on cases, deaths, hospitalizations, tests and...

State data shows of the 670 patients marked as being infected with the virus on Friday, just over two in five were admitted because...

An analysis of memory T cells induced by messenger RNA vaccination reveals that they maintain polyfunctionality in response to the Omicron spike...

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    T cells protect us against severe COVID. Pfizer vaccine induces memory T cells which robustly respond to the Omicron spike protein (no difference here between 2 or 3 doses). Those T cells respond to the Omicron variant with preserved polyfunctionality. https://t.co/Fbk0CUp4YU - view on twitter

Background: A substantial proportion of persons who develop COVID-19 report persistent symptoms after acute illness. Various pathophysiologic mechanisms have been implicated in the pathogenesis...

Why is the U.S. seeing a surge in hospitalizations that looks poised to surpass last winter’s...

Tests by Pfizer-BioNTech show three COVID shots for children under 5 appear to be safe and effective. The dose is one-tenth as much as...

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    Pfizer vaccine 6 month to 5 years. 3 microgram dose now with 3 shots (2 shots didn’t elicit adequate antibody response 2-4 year olds). 1700 children. 80% effective against symptomatic omicron. Safe. No severe disease either arm https://t.co/XZzzt5H9MQ - view on twitter

Wearing a mask is now optional on airplanes and other modes of public transit in the U.S., in most cases. Here’s how, even if...

This case series study of COVID-19 data from a US university examines the effectiveness of various vaccination, testing, and surveillance measures to mitigate spread...

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    Mask mandates and surveillance testing did not arrest Omicron spread at Cornell but vaccines prevent severe disease. Symbolic of what was seen with Omicron worldwide (eg S Korea/Hong Kong. Masks both countries but former with high vax rates) https://t.co/4dPfwcP6os - view on twitter

Background Long COVID is a post-severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection syndrome characterised by not recovering for several weeks or months following...

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    era helpful to see that these symptoms of long COVID are the same in someone who receives 2 dose of vaccine than if never had COVID (and lower than in unvaccinated). So, more studies coming but NIH study rigorous & vaccines help this evolving story https://t.co/jtZ6aoDmFA - view on twitter

Background Long COVID is a post-severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection syndrome characterised by not recovering for several weeks or months following...