The accuracy of coronavirus tests has been again thrust into the spotlight, after a man who authorities said died from COVID-19, actually didn't.

When 30-year-old Nathan Turner died last week, Queensland Health said he had tested positive to COVID-19.

But further testing showed that he was negative.

So how did the test get it wrong, and how common could it be?

On today's show:

* How do you even get a false positive?

* How is the coronavirus death rate calculated?

* If Australia is locked down, where would a second wave come from?

* Why are there still cases in hotel quarantine?

As riots rage across large cities in the United States, some are happening right in the middle of major COVID-19 hotspots.

Thousands of people have already died from the virus in cities like Washington DC and New York, and the epidemic is still not under control.

So what could it mean for America's response to coronavirus?

On today's show:

* What could US riots mean for coronavirus cases?

* Why are so many schools in Israel closing?

* Is there any evidence that masks work?

And Norman has a study of COVID-19 patients with diabetes, which shows that 10 percent die within seven days.

As the days get shorter and colder, many people are wondering what it might mean for coronavirus infections.

One theory states that countries in the northern hemisphere have suffered more because they were in their winter months.

So as Australia ticks over to a new season, could the weather play any part in the severity of an epidemic here?

On todays show:

* What might winter mean for coronavirus?

* More Ruby Princess, but this time it's a tuberculosis problem

* What's going on with Victoria?

And Norman has some more information regarding a question from last week's episode about the accuracy of coronavirus tests.

So you've just had a coronavirus test, and had a little stick shoved up your nose and wobbled around.

But while you’re waiting for a result, have you thought how accurate it might be?

Turns out the so-called false negative rate - that's when positive cases are wrongly found to be negative - can be as high as one in three on average.

What might that mean for Australia's fight against the virus?

On today's show:

* Can I get married in India in November?

* Do vaccines need to be 100% effective to be good?

* How accurate are coronavirus tests?

And we have a special announcement about the Together in Art Kids exhibition. Meet one of the kids who has submitted some amazing work, and the next artist who will help curate the next round of submissions.

If you want to see the art from the "Inner Worlds" exhibition, visit the Together In Art website (search for Together In Art Kids or find the link on our website).

It's been just over a month since the Federal Government released the COVIDSafe app to help contact tracers track down potentially positive COVID-19 cases.

It was sold as a vital tool to reopen the Australian economy and help get things moving again.

So how has the app been used since then? Has it been the key to get things moving or has it been forgotten?

On today's show:

* What’s the history of the app so far?

* How many downloads has it had?

* Is it still being sold as a vital tool?

* Why isn't the Government being transparent about the app’s functionality?

* What successes has it had?

* Has the source code been released?

* How many people have since deleted it?

You might have thought we were finally getting on top of coronavirus, but the pandemic is not without its surprises.

There's been a few cases in the past few days that have health authorities scratching their heads.

Two school kids in Sydney have tested positive, and there's a case in Queensland that apparently dates back to the Ruby Princess.

So what's going on? And what might it say about the level of community transmission of the virus?

On today's show:

* What do the cases in Sydney schools mean for community transmission numbers?

* Is coronavirus more common out in the wild that we thought?

* How can there be another case from the Ruby Princess?

* Are enough people still getting tested to give a true indication of the spread?

And Norman's here to explain the latest from the vaccine trial that's just started in Australia. But how can they test it here if there are such low active cases?

There are all sorts of options when picking a mask to help protect yourself and other people from picking up coronavirus.

But some masks can be expensive, and not every mask is equal.

Firstly, you have to wear it correctly. Secondly, you want to make sure it's doing what it is supposed to.

So what mask should you choose?

On today's show:

* What mask should I wear and can I make my own?

* What’s going on with state border closures? Is there any point?

* Can smoking help inhibit coronavirus?

And Norman and Tegan discuss a few pieces of research about how long coronavirus may be infectious for.

At the height of the Australian coronavirus epidemic, older people were urged to stay away from children and grandchildren to avoid contracting the virus.

Age is a major risk factor for COVID-19, and many older people made the emotional decision to stay away from loved ones.

But as the number of active cases continues to fall, families are wondering if it's okay once again for grandparents to hug and be around their children and grandchildren.

On today's show:

* Is it ok to hug our parents again?

* What should people aged over 70 be doing now?

* Why is it ok for kids to go to school, but not visit grandparents?

And Norman talks about a study how coronavirus affects the immune system and what it could mean for designing treatments.

We know that in the 1918 flu pandemic the second wave was far more deadly than when it first arrived.

This time around in Australia, it seems we may avoid a terrible second wave but that may make us more vulnerable to a third wave.

By the end of this year and into 2021, we'll have little natural immunity, a vaccine may not be available and there's a danger that complacency may have set in.

On today's show:

* Norman goes on a bit of a tear about masks, and says if we all wore them we could re-open society much more quickly

* How should social distancing work on flights?

* Will any second or third coronavirus wave be better or worse than the 1918 flu?

When coronavirus infects someone, we know they can spread the disease via coughing and sneezing.

But what about other forms of bodily fluid like blood?

Around the world, there have been no reports of transmission that have definitely proven blood to be the cause.

But the virus has been found in our blood, so it is theoretically possible.

So what could this mean for blood donations?

On today's show:

* Is giving blood safe?

* If someone with the virus coughed or sneezed on another's open wound, can the virus get into the bloodstream then the lungs?

* Is there a chance we've eradicated the seasonal flu seeing as its infection rate is much lower than coronavirus?

* If there are no new cases and haven't been for a while, like in WA, why do we need to continue with social distancing?