Study

Aboard the Diamond Princess, a Case Study in Aerosol Transmission

“We’re getting surprises all the way along,” Dr. Conly said. “This paper I find interesting, but it has a long way to go to be able to get into a line of credibility, in my mind.”

Dr. George Rutherford, a professor of epidemiology at the University of California, San Francisco, was equally skeptical. He said that, outside of hospital settings, “large droplets in my mind account for the vast majority of cases. Aerosols transmission — if you really run with that, it creates lots of dissonance. Are there situations where it could occur? Yeah maybe, but it’s a tiny amount.”

Dr. Tang and other scientists strongly disagree. “If I’m talking to an infectious person for 15 or 20 minutes and inhaling some of their air,” Dr. Tang said, “isn’t that a much simpler way to explain transmission than touching an infected surface and touching your eyes? When you’re talking about

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Children May Carry Coronavirus at High Levels, Study Finds

It has been a comforting refrain in the national conversation about reopening schools: Young children are mostly spared by the coronavirus and don’t seem to spread it to others, at least not very often.

But on Thursday, a study introduced an unwelcome wrinkle into this smooth narrative.

Infected children have at least as much of the coronavirus in their noses and throats as infected adults, according to the research. Indeed, children younger than age 5 may host up to 100 times as much of the virus in the upper respiratory tract as adults, the authors found.

That measurement does not necessarily prove children are passing the virus to others. Still, the findings should influence the debate over reopening schools, several experts said.

“The school situation is so complicated — there are many nuances beyond just the scientific one,” said Dr. Taylor Heald-Sargent, a pediatric infectious diseases expert at the Ann

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Johnson & Johnson’s Covid-19 Vaccine Protects Monkeys, Study Finds

An experimental coronavirus vaccine developed by Johnson & Johnson protected monkeys from infection in a new study. It is the second vaccine candidate to show promising results in monkeys this week.

The company recently began a clinical trial in Europe and the United States to test its vaccine in people. It is one of more than 30 human trials for coronavirus vaccines underway across the world. But until these trials are complete — which will probably take several months — the monkey data offers the best clues to whether the vaccines will work.

“This week has been good — now we have two vaccines that work in monkeys,” said Angela Rasmussen, a virologist at Columbia University who was not involved in the studies. “It’s nice to be upbeat for a change.”

But she cautioned that the new results shouldn’t be used to rush large-scale trials in humans. “We just can’t

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Spring School Closures Over Coronavirus Saved Lives, Study Asserts

But other experts noted that the impact of preventive measures taken by states — including stay-at-home orders, closures of restaurants and nonessential businesses and limits on large social gatherings — simultaneously or shortly after school closings, made it hard to determine the specific role of schools in such analyses.

“I think we have to be incredibly cautious when interpreting estimates from a study like this,” said Julie Donohue, a professor of public health at the University of Pittsburgh who co-wrote an editorial about the study. “In particular, I think it’s important to emphasize that we really can’t isolate the impact of school closures from other interventions.”

Dr. Donohue added that “even if these numbers were accurate or valid, we don’t know how much of the effect would be derived from reducing contacts among kids at school, versus reducing contacts among parents who have to stay home from work because

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