Covid

Researchers have found more evidence that coronavirus was circulating at low levels across the United States as early as December 2019 -- weeks before the first officially reported cases.

Labs like the one in Wuhan are essential to preparing for future pandemics

The face mask mandate that's been in place for more than a year to protect against the coronavirus expired in Massachusetts on Saturday.

Pandemic summer uncertainty with Julia Marcus

New research backs up the idea that dogs can accurately sniff out COVID-19.

When the governor lifted the state’s mandate, liberals predicted disaster. But it never came. Why?

Critics worry about his tendency, in conversations with politicians, in media interviews, and in tweets, to downplay Covid-19's impact.

The number of people fully vaccinated against COVID-19 in Massachusetts is approaching 50%, state officials said.

The infections are not a surprise. They may even be a good thing.

Following SARS-CoV, MERS, and SARS-CoV-2 (the cause of COVID-19), researchers have detected yet another novel coronavirus jumping from animals to people. In this case, the source are dogs. Spurred …

I'm going to regret writing about this, but it's not a topic to be ignored. Where did the current coronavirus come from? If you ask that question, you get all sorts of answers from all sorts of people. Let me downgrade some of those right up front. To start at the far end of the fever scale, I do

US News is a recognized leader in college, grad school, hospital, mutual fund, and car rankings. Track elected officials, research health conditions, and find news you can use in politics, business, health, and education.

Both the Pfizer and Modern COVID-19 vaccines provide effective protection from the novel virus even after the first shot. According to a real world study by the CDC, both vaccines reduced the risk of infection by 80% two weeks after the first dose.

The Covid-19 vaccine developed by Pfizer and BioNTech is 85 percent effective at preventing symptomatic Covid-19 after one dose, according to a new study.

Also, 63% of Americans are now willing to be immunized, up from 50% in September.

In a new report, independent experts detail the ‘toxic cocktail’ of poor choices and systemic failures that created the current pandemic catastrophe.

We have a special edition of the newsletter on a misleading C.D.C. statistic.

Early in 2020 as the pandemic began to surge around the world, Asia and the West were divided on whether people should wear facemasks to try and stop/slow transmission of the new virus. In short, Asian countries went very heavy on masks early on, while most Western countries initially said they wouldn’t help and kept saying so in increasingly forceful ways until suddenly reversing course in April/May 2020. I think most people have forgotten how extreme this divergence in views was, so I’ve tried to summarise it all here.

In some respects, it's easy to make direct comparisons between the three vaccines; in others, it's more complicated.

The decision, based on data from a Phase 3 trial, makes Pfizer's Covid vaccine the first to be available for use in children under age 16.

I've had several requests for comment on this recent PNAS paper, which talks about integration of SARS-CoV-2 sequences into the DNA of human cells. I'm glad to do it, but right off I have to note that a lot of the attention that it's getting seems (sadly) to be coming from anti-vaccine activists, wh

"It's been a success," said County Executive Mark Poloncarz. "We figured it would be pretty good, but now we're seeing the results."

We already lived with a system that did not value care. What changed with the pandemic that so ruffled the feathers of the nation’s papers of record?

68-year-old Jeff Foxon came home after being in a hospital and rehab for seven weeks. His welcoming committee was his two grandkids.

This is the first Covid-19 vaccine in the United States to be assessed for full approval from the FDA.

A lumber frenzy has taken over homebuilding, Home Depot, and the internet.

In the United States, the analysis estimates, 905,000 people have died of Covid since the start of the pandemic.

The number of Americans getting their first and second doses of the COVID-19 vaccine is growing daily. Use these charts to track how the nation is doing administering vaccinations overall or see how your state is fairing specifically. Watch this page as more people become eligible, medical professionals work through existing doses, and the Food and Drug Administration potentially approves new vaccines.

"No serious safety concerns have been identified to date," Moderna said about the trial on teens.

Starting Monday, visitors at the Massachusetts vaccination super-sites can walk in without an appointment, with the exception of Gillette Stadium.