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Jan. 24, 2021, 12:17 p.m. EST

Why do I need to wear a mask if I’ve had COVID-19? Who is it protecting? Can I really be reinfected?

‘Like everyone else, I am hoping that the vaccine will help infection rates and more people can get back to work’

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By Quentin Fottrell, MarketWatch

Dear Moneyist,

Why do I need to wear a mask if I have already had COVID-19? I can’t infect anyone, and I can’t be infected by someone. Like everyone else, I am hoping that the vaccine will help infection rates and more people can get back to work. Who is it protecting when I wear a mask? Can I be reinfected?

LeRoy

The Moneyist: For some, Biden’s $1.9 trillion COVID-19 rescue plan is a ‘lifeline’ — and wouldn’t come a moment too soon

Dear LeRoy,

Yes, you can. A recent study in the New England Journal of Medicine concluded that health-care workers in the U.K. who tested positive for immunoglobulin G (IgG) antibodies were protected against the coronavirus for the subsequent six months. But some people, it found, could become re-infected after that, so health professionals ask everyone to wear a mask.

“The extent to which previously infected people are protected from a second infection is uncertain. Understanding whether post-infection immunity exists, how long it lasts, and the degree to which it may prevent symptomatic reinfection or reduce its severity has major implications for the SARS-CoV-2 pandemic,” the study found. Immunity may wane more quickly in some people.

Another reason: If one person doesn’t wear a mask, it could create a domino effect that leads someone else to relax their practice, and another and another. They may not know you had the virus less than six months ago, and it could result in other people being infected. Masks also help to act as a deterrent against touching your face, and remind people that the pandemic isn’t over. (It’s also flu season.)

Related: ‘The attack rate is relatively high as there’s no immunity to it.’ Why coronavirus was never going to be just another flu

The Centers for Disease Control and Prevention have said they’re still evaluating reinfection risks. Reinfection is relatively rare, but it has happened, and the virus continues to spread and develop new mutations, some of which have been more contagious than previous strains. If you want people to get back to work and the economy to recover, wear a mask and practice social distancing.

William Haseltine, a scientist, biotech entrepreneur and infectious disease expert, wrote for Project Syndicate: “We should assume that none of the vaccines under development will prevent infection or provide lifelong, lasting immunity. At best, they will limit the symptoms of those infected and minimize the number of COVID-19 cases that progress to severe illness.”

“China showed that new infections could be halved in just two weeks through standard measures such as enforced mask-wearing, social distancing, and mandatory quarantine and isolation,” he added. “By contrast, in countries like Brazil, the United Kingdom, and the United States, national political leaders dismissed the threat and dithered in marshaling the appropriate response.”

Wear your mask. Keep yourself and others safe.

The Moneyist: My wife and I have 3 kids. I also have 3 kids from a previous marriage. How should we split our house among these 6 children?

As of Sunday, COVID-19 had infected over 94.6 million people worldwide, which mostly does not account for asymptomatic cases, one of the major ways the virus has spread around the world so quickly, and killed over 2 million, including 395,855 in the U.S. The U.S. has the world’s highest number of COVID-19 cases (23.4 million), followed by India (10.5 million), Brazil (8.4 million) and Russia (3.5 million), according to data aggregated by Johns Hopkins University.

The Dow Jones Industrial Average /zigman2/quotes/210598065/realtime DJIA -1.50% , S&P 500 /zigman2/quotes/210599714/realtime SPX -0.48%  and Nasdaq Composite /zigman2/quotes/210598365/realtime COMP +0.56%  had a tumultuous 2020, and were lower Friday as investors effectively sold the news of Biden’s more generous stimulus proposal, which had been widely anticipated. The market was dampened by worries over the potential for tax increases and increased risk of more political unrest after last week’s siege on the U.S. Capitol by supporters of President Donald Trump.

Want to read more? Follow Quentin Fottrell on Twitter and read more of his columns here.

<STRONG>Hello there, MarketWatchers. Check out <INTERNET URL="https://www.facebook.com/groups/moneyist/" LOCATION="EXTERNAL">the Moneyist private Facebook</INTERNET><PHRASE TYPE="COMPANY" SIGNIFICANCE="PASSING-MENTION"><SYMBOL COUNTRY="US" TICKER="FB"></SYMBOL></PHRASE> group where we look for answers to life’s thorniest money issues. Readers write in to me with all sorts of dilemmas. </STRONG>

<STRONG> <EMPHASIS> <STRONG>Quentin Fottrell is MarketWatch’s Moneyist columnist. You can email The Moneyist with any financial and ethical questions at qfottrell@marketwatch.com</STRONG> </EMPHASIS> <STRONG>. By emailing your questions, you agree to having them published anonymously on MarketWatch. </STRONG> </STRONG>

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US : S&P US
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US : U.S.: Nasdaq
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Quentin Fottrell is MarketWatch's personal-finance editor and The Moneyist columnist for MarketWatch. You can follow him on Twitter @quantanamo.

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