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Dr. Jon Hallberg, medical director of the University of Minnesota Physicians Mill City Clinic, joined MPR News host Tom Crann again this week to answer some audience questions about COVID-19.

You can find last week’s questions and answers 

I've had COVID-19 symptoms for five days. I was told by my doctor to self-quarantine and that I didn't qualify for testing and that no follow up was needed because I didn't have respiratory issues. How will our state know the impact and number of coronavirus cases without any tracking of people like me? 

It's this conundrum that we're in. We have all these people who are symptomatic and we're basically not offering testing to them because they're too healthy. In addition, we also know that people can have COVID-19 infection and actually have no symptoms at all. 

The only way that we’ll someday have a good sense of this will be antibody testing, you know, proof that we've been exposed to the virus. And it requires some very interesting mathematical statistical modeling to figure that out. 

Limited testing leaves many sick Minnesotans without answers

What is an antibody test?

If it's transmitted by breathing in respiratory droplets, then why are we washing our hands so often? 

Well, those droplets land on things and we're constantly using our hands to open doors and to turn things and grab things and pick up things. And if we then take those hands and rub our eyes, rub our nose, eat food, we're introducing those droplets into our respiratory tract. 

What we know about silent spreaders

On how to master the 20-second hand-wash

Will leaving a face mask out in the sun's ultraviolet rays for three hours kill the virus? And if so, can hospitals or clinics reuse the masks?

Well, if you have your own cloth mask and you want to leave it outside with the hope that maybe some UVA exposure will kill the virus, that's fine. I'm not sure that we know that that really does the trick. But they are starting to take things like N95 masks in the hospitals, putting on special racks, exposing them to these special 

Of course, there are a lot of studies underway. How much exposure do they need for how long? That's all being figured out. But, yes, they are starting to do this in the hospitals.

Can sunlight kill the virus? How risky is an elevator ride?

Here's how to clean them

You've begun to see more patients who have gotten over COVID-19, and some had a pretty severe experience. What are you seeing and what do we need to know about how serious this disease can be?

I think people are really falling into one of three categories: people who may have been exposed and they don't have any symptoms; people who had symptoms and are told to shelter in place; and then there's a subset of people who get hospitalized. And even within that subset, there are those who end up in the intensive care units.

The stories that I'm now hearing from patients who've been in places like Florida, for example, at a conference that turned disastrous and who then spent eight days in a hospital there, it's really catastrophic and horrifying. And so I think for anyone who questions how severe this is, there's just no question in my mind. 

I talk to my colleagues at the university who are in touch with their colleagues at the places like National Institutes of Health. And we all have friends and colleagues at work in Seattle or New York. The stories are real. The consequences are great. What we understand about this virus keeps expanding. And there's no question that we need to be taking this as seriously as we possibly can.

Do you have other questions you want us to answer? Let us know here:

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With limited testing, how will the state know the full scope of COVID-19? If you’re infected by breathing the virus in, why wash your hands? Can sunlight decontaminate face masks? Dr. Jon Hallberg answers some audience questions about COVID-19. 

With limited testing, how will the state know the full scope of COVID-19? If you’re infected by breathing the virus in, why wash your hands? Can sunlight decontaminate face masks?

Round 2: Dr. Hallberg answers your coronavirus questions

Go Deeper.

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