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Interesting Article About Mask Wearing

July 14, 2020 01:33PM
Masks offer much more protection against coronavirus than many think

By RONG-GONG LIN II, MAURA DOLAN
JULY 14, 2020 5 AM UPDATED 1:40 PM


SAN FRANCISCO — There’s a common refrain that masks don’t protect you; they protect other people from your own germs, which is especially important to keep unknowingly infected people from spreading the coronavirus.
But now, there’s mounting evidence that masks also protect you.

If you’re unlucky enough to encounter an infectious person, wearing any kind of face covering will reduce the amount of virus that your body will take in.

As it turns out, that’s pretty important. Breathing in a small amount of virus may lead to no disease or far more mild infection. But inhaling a huge volume of virus particles can result in serious disease or death.

That’s the argument Dr. Monica Gandhi, UC San Francisco professor of medicine and medical director of the HIV Clinic at Zuckerberg San Francisco General Hospital, is making about why — if you do become infected with the virus — masking can still protect you from more severe disease.

“There is this theory that facial masking reduces the [amount of virus you get exposed to] and disease severity,” said Gandhi, who is also director for the Center for AIDS Research at UC San Francisco.

The idea of requiring mask-wearing in public has become an increasingly pressing and politicized issue as California and the rest of the nation see a surge in new cases as the economy reopens.

California this week ordered a reclosure of many businesses, include a statewide halt to all indoor dining and the closure of bars. The state also ordered the closure — in dozens of hard-hit counties, including L.A. County — of indoor gyms, houses of worship, hair salons, nail salons and offices for nonessential industries.

But experts say masks are essential for people to wear when they go out in public, such as to shop or go to medical appointments, and when close to other people at the beach or park.

California has mandated face coverings in public settings since June 18, and a growing number of communities say they will ticket people who disobey the rules. But there remains resistance to the government mandating wearing masks in some corners of the state, including Orange County.

Some leaders in Orange County have pushed back against requiring students to wear masks should they return to classrooms in the fall.

In policy recommendations approved by the Orange County Board of Education on Monday, a document stated that “requiring children to wear masks during school is not only difficult — if not impossible to implement — but [is] not based on science. It may even be harmful.” Individual districts will have the final say on how schools open.

Some health experts were appalled by that language.

“This anti-mask rhetoric is mind-blowing, dangerous, deadly and polarizing,” said Dr. Peter Chin-Hong, professor of medicine and an infectious diseases specialist at UC San Francisco. “There is no evidence that it is dangerous.”

In fact, wearing masks can help prevent children from being infected and suffering serious consequences of infection, such as multisystem inflammatory syndrome, a rare condition that has been seen in children who have been infected with the coronavirus. “Kids not only transmit, but they can get sick as well,” Chin-Hong said.

While children are less likely to develop severe illness from the coronavirus than adults, they can still be infected, be contagious and transmit the virus to other people, Gandhi said.

Wearing a mask at school would not only reduce their ability to transmit the virus to other classmates, teachers and administrators, but also protect the students from getting infected with a large dose of virus from infected people.

Transmission rates for coronavirus have been rising across the state. Nearly 1,000 of San Francisco’s nearly 4,600 cases have been diagnosed in just the last two weeks, said Dr. Grant Colfax, the city’s director of public health.

In San Francisco, nearly half of all those who have tested positive in the city are Latinos, he said, even though Latino residents make up just 15% of the city’s population. Overall, the city has seen 7.8 new infections per 100,000 residents over the last seven days, far above its goal of no more than 1.8 new infections per 100,000 people.

“This, again, indicates that the virus is spreading throughout the city, particularly ... in the southeast part of the city,” Colfax said.

For every one person who contracts the virus, another 1.25 people on average are now infected, he said. “We really need to drive that down to 1 or below as quickly and as soon as possible.”

The transmission rate also rose above 1 in L.A. County in June, but has fallen back to 1. “The virus currently rages on in our community,” Public Health Director Barbara Ferrer said.

The reason why masks are so important in controlling the spread of the coronavirus is that it can be widely spread by people who are not visibly sick — either because they haven’t yet shown signs of illness, or they will spend the entire course of their infections with little or no symptoms at all.

A key piece of evidence for this emerged earlier this year, on the Diamond Princess cruise ship that carried infected crew and passengers in Asia. A study published by the U.S. Centers for Disease Control and Prevention found that of 712 people testing positive for the virus, nearly half were asymptomatic at the time of testing.

“We also know that viral load is highest early during disease,” said Dr. Chaz Langelier, an assistant professor at UC San Francisco, during the panel discussion. In fact, 44% of transmissions are believed to occur when the infected person has no symptoms, according to a study published in Nature Medicine.

That’s different from the seasonal flu, where peak infectiousness occurs about one day after the onset of symptoms, Langelier said.

Masks don’t filter out all viral particles, Gandhi said. But even cloth face masks filter out a majority of viral particles.

And even if a person wearing a mask gets infected, the mask — by filtering out most of the viral particles exhaled by the infected person — probably leads to less severe disease, Gandhi said.

The idea that a lower dose of virus when being infected brings less illness is a well-worn idea in medicine.

Even going back to 1938, there was a study showing that by giving mice a higher dose of a deadly virus, the mice are more likely to get severe disease and die, Gandhi said.

The same principle applies to humans. A study published in 2015 gave healthy volunteers varying doses of a flu virus; those who got higher doses got sicker, with more coughing and shortness of breath, Gandhi said.

And another study suggested that the reason why the second wave of the 1918-19 flu pandemic was the deadliest in the U.S. was because of the overcrowded conditions faced in army camps as World War I wound down. “In 1918, the army camps [were] characterized by a high number of contacts between people and by a high case-fatality rate, sometimes 5 to 8 times higher than the case-fatality rate among civilian communities,” the study said.

Finally, a study published in May found that surgical mask partitions significantly reduced the transmission of the coronavirus among hamsters. And even if the hamsters protected by the mask partitions acquired the coronavirus, “they were more likely to get very mild disease,” Gandhi said.

So what happens if a city dramatically masks up while in public?

If Gandhi is right, it may mean that even if there’s a rise in coronavirus infections in a city, the masks may limit the dose people are getting of the virus and result in them more likely to show less severe symptoms of illness.

That’s what Gandhi said she suspects is happening in San Francisco, where mask wearing is relatively robust. Further observations are needed, Gandhi said.

There’s more evidence that masks can be protective — even when wearers do become infected. She cited an outbreak at a seafood plant in Oregon where employees were given masks, and 95% of those who were infected were asymptomatic.

Gandhi also cited the experience of a cruise ship that was traveling from Argentina to Antartica in March when the coronavirus infected people on board, as documented in a recent study. Passengers got surgical masks; the crew got N95 masks.

But instead of about 40% of those infected being asymptomatic — which is what would normally be expected — 81% of those testing positive were asymptomatic, and the masking may have helped reduce the severity of disease in people on board, Gandhi said.

The protective effects are also seen in countries where masks are universally accepted for years, such as Taiwan, Thailand, South Korea and Singapore. “They have all seen cases as they opened...but not deaths,” Gandhi said.

The Czech Republic moved early to require masks, issuing an order in mid-March, Gandhi said; that’s about three months before Gov. Gavin Newsom did so statewide in California. But in the Czech Republic, “every time their cases would go up...their death rate was totally flat. So they didn’t get the severe illness with these cases going on.”

By May, the Czech Republic lifted its face mask rule. “And they’re doing great,” Gandhi said.

LA Times
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  Re: What if ‘Herd Immunity’ Is Closer Than Scientists Thought?

PHDram183August 17, 2020 06:53PM

  Re: What if ‘Herd Immunity’ Is Closer Than Scientists Thought?

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  Re: What if ‘Herd Immunity’ Is Closer Than Scientists Thought?

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  Re: What if ‘Herd Immunity’ Is Closer Than Scientists Thought?

waterfield228August 18, 2020 07:55AM

  Re: What if ‘Herd Immunity’ Is Closer Than Scientists Thought?

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  Re: What if ‘Herd Immunity’ Is Closer Than Scientists Thought?

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AlbaNY_Ram207August 18, 2020 05:30PM

  Re: One-size Covid policy doesn’t not fit all. (Article)

ramBRO217August 18, 2020 06:54PM

  Just saw my internist

waterfield212August 18, 2020 03:12PM

  Re: Just saw my internist

MamaRAMa194August 18, 2020 03:25PM

  Re: Just saw my internist

waterfield202August 18, 2020 07:40PM

  Re: Just saw my internist

zn171August 18, 2020 08:24PM

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JamesJM214August 18, 2020 08:37PM

  Re: It's time to come to grips with what this means...

zn214August 18, 2020 09:01PM

  What I find is that...

JamesJM193August 18, 2020 09:30PM

  Re: What I find is that...

zn189August 18, 2020 10:09PM

  In all sincerity, ZN...

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  Re: In all sincerity, ZN...

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  Why me? (nm)

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  Re: Why me? (nm)

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  Re: That was answered.. in unequivocal terms..

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  Re: It's time to come to grips with what this means...

ramBRO505August 19, 2020 04:53AM

  theories?

PHDram360August 19, 2020 05:20AM

  Re: theories?

ramBRO207August 19, 2020 06:26AM

  Re: theories?

AlbaNY_Ram187August 19, 2020 06:49AM

  Re: theories?

ramBRO200August 19, 2020 07:12AM

  Re: theories?

AlbaNY_Ram321August 19, 2020 02:32PM

  Re: theories?

PHDram279August 19, 2020 04:35PM

  cost benefit

PHDram196August 19, 2020 10:57AM

  Re: cost benefit

AlbaNY_Ram264August 19, 2020 02:15PM

  Re: cost benefit

PHDram322August 19, 2020 05:01PM

  Re: cost benefit

waterfield222August 19, 2020 09:57PM

  i disagree

PHDram230August 20, 2020 05:10AM

  Re: i disagree

waterfield654August 20, 2020 09:37AM

  Re: i disagree

zn171August 20, 2020 09:59AM

  no it doesnt sound familiar.

PHDram183August 20, 2020 11:55AM

  Re: no it doesnt sound familiar.

waterfield230August 20, 2020 01:40PM

  Re: no it doesnt sound familiar.

PHDram193August 20, 2020 04:52PM

  Re: no it doesnt sound familiar.

waterfield187August 20, 2020 07:48PM

  Re: no it doesnt sound familiar.

zn182August 20, 2020 08:38PM

  Re: no it doesnt sound familiar.

PHDram246August 21, 2020 11:35AM

  Re: no it doesnt sound familiar.

waterfield201August 21, 2020 12:04PM

  Isn't that what I said above?

PHDram180August 22, 2020 03:26PM

  gotcha

PHDram247August 19, 2020 10:49AM

  Re: Just saw my internist

ramBRO224August 18, 2020 03:38PM

  He was scary

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  I can’t believe this is a real article

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  A thank you to those who have posted in this thread

AlbaNY_Ram184August 21, 2020 06:26AM

  Absolutely what AlbaNY said ^^^^

RAMbler202August 21, 2020 11:38AM