Virus basics: Is a face shield as safe as a mask? 11 of your COVID-19 questions answered

The office you once knew is likely to look vastly different.

Health experts think people who had COVID-19 will have some immunity against a repeat infection. But they don't know how much protection or how long it would last.

There have been reports of people testing positive for the virus weeks after they were believed to have recovered, leading some to think they may have been reinfected. More likely, experts say people were suffering from the same illness or the tests detected remnants of the original infection. There's also the chance tests could have been false positives.

The Federal Reserve has seen a significant decline of coins in circulation because people are not spending them as regularly at businesses, many of which are either temporarily closed or not accepting cash.

Coins are still plentiful. In April, the U.S. Treasury estimated more than $47.8 billion were in the market, up by more than a billion dollars compared to last year.

It depends on where you live and the precautions you and the gym take.

If cases of COVID-19 are poorly controlled where you live, experts say it's best to stay away. But if you live in an area where the spread is being contained, there are ways to minimize risk when going for a workout.

Coronavirus doesn't seem to have changed in a way that makes people less or more sick. There's some evidence that a specific mutation called D614G may have made it easier for the virus to be transmitted between people. But not all scientists are convinced, and it's hard to say how strong any such effect might be.

Does a face mask protect me, or just the people around me? It likely provides protection for both.

Employers are generally not required to tell workers when someone in the workplace has tested positive for the coronavirus.

Pick one that contains mostly alcohol, and has few other ingredients.

The U.S. Centers for Disease Control and Prevention says hand sanitizers should be at least 60% ethyl alcohol or 70% isopropyl alcohol. Other approved ingredients may include sterile distilled water, hydrogen peroxide and glycerin, according to the U.S. Food and Drug Administration.

No. Health officials don't recommend the clear plastic barriers as a substitute for masks because of the lack of research on whether they keep an infected person from spreading viral droplets to others.

There are three broad categories of coronavirus tests in the U.S. Two diagnose whether you have an active infection, and a third indicates if you previously had the virus.

Whether students have to wear masks, and the trouble they could face if they don't, depends on where they go to school.

It's impossible to tell without a test. Influenza and COVID-19 have such similar symptoms, you may need to get tested to know what's making you miserable.

It appears the virus can spread among children and teens, but how easily may vary by age. Research is still underway, but children under age 10 seem to be less likely than older kids to transmit the virus to other children and adults.

Children generally don't appear to get sick or experience symptoms as often as adults when they're infected. Some evidence suggests that may be particularly true for younger kids. That might help explain why they appear less likely to spread the virus — they're less likely to be coughing and sneezing.