Coronavirus Briefing: 'Invisible Mist'

Here's why bars and restaurants are hotbeds for the virus.

An informed guide to the global outbreak, with the latest developments and expert advice about prevention and treatment.

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The danger indoors

Elected officials in the United States are beginning to acknowledge that the rush to reopen was a mistake, as many of the hardest-hit areas in recent weeks have been places that lifted lockdown restrictions fastest. And one factor seems to be playing an outsize role in the uptick: indoor transmission from businesses like bars and restaurants.

More than 239 scientists from 32 countries are now warning that airborne transmission of the virus indoors should be taken more seriously and are calling on the World Health Organization to revise its recommendations, which they say underestimate the dangers of transmission by tiny, viral particles that linger in the air indoors.

Our colleague Donald G. McNeil Jr., who covers science for The Times, told The Daily podcast that when people talk or laugh, they create an “invisible mist” or a “droplet cloud” of tiny particles that floats around near their head. That fog can hold enough virus to transmit the disease; walking into it is akin to someone “spitting on your face.”

Indoors, without a breeze, the cloud can drift across a room, like in a bar or at a cocktail party, at more or less head level, he said, to be inhaled by revelers until 20, 30 or 40 people are infected.

Evidence is also mounting, Donald said, that Covid-19 is more of a blood vessel disease than a respiratory disease. While the virus enters the body through the lungs, it seems to do its damage by attaching to the insides of blood vessels, infecting organs, like the kidneys and the brain, with lots of fine blood vessels.

“When they do autopsies, they find thousands of tiny little blood clots all over the body,” Donald said. That explains why some patients may experience strokes, dementia and disorientation — and why children and young adults have experienced so-called Covid toe.

Ancient history meets modern disease. A gene segment inherited from Neanderthals around 60,000 years ago increases the risk of severe illness from the coronavirus, according to a new study. The variant is common in Bangladesh, which may explain why patients of Bangladeshi descent are dying at a higher rate in Britain.

Partying on while the virus rages

Florida has quickly become a cradle of infection in the U.S. On the Fourth of July, the state reported a record 11,458 new cases — more than a fifth of the nation’s total tally that day. As hospitals begin to fill up with coronavirus patients, some local officials are pointing the finger at over-the-top house parties.

In Miami, where nightclubs were closed in March, some homes have turned into all-night venues with bouncers and maskless revelers who flout social-distancing guidelines. Cases among young people have increased, but cracking down on house parties is much harder than, for example, forcing restaurants and bars to scale back or to close. And partygoers have made the job even more challenging for overwhelmed contact tracers in Florida, often refusing to share information about whom they were with.

Because of the skyrocketing infection rate, the mayor of Miami-Dade County signed an executive order today that would effectively shut down Miami’s social scene. Beginning on Wednesday, residents will be under a curfew and indoor dining at restaurants, gyms, banquet facilities and other entertainment venues will be shut down.

The inequality of the virus

New data from the Centers for Disease Control and Prevention shows that in the U.S., Black and Latino people have been three times as likely to become infected with the coronavirus as their white neighbors — and nearly twice as likely to die from it.

The new numbers present the most thorough look yet at the disproportionate toll of the virus across urban, suburban and rural areas. The C.D.C. released the data only after The Times sued the agency to make it public.

Resurgences

What else we’re following

What you’re doing

My mother is 102 years old and lives at her home with 24/7 care. Social contact is vital to her mental and emotional health. Visitors, including great-grandchildren and friends, do driveway wave-bys while she sits on the front deck. Everyone is elated by the experience, knowing that she was born during an influenza pandemic in 1918 and still thriving through this one. She gives us hope.
— Rosemary Tralli, Glastonbury, Conn.

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