With coronavirus spreading, heaps of people are wondering if getting a flu shot earlier this year is worth it.

And as more people need tests, how do the swabs work and how long does it take?

On the show today:

* How long does testing for coronavirus take?

* Flu shot season is rapidly approaching, so should you get one earlier than usual? How will it help?

* Can you start infecting other people with coronavirus before you start showing symptoms?

* What happens to people who have weak immune systems?

And you might have seen the study which indicated coronavirus had mutated. But has it really? Dr Norman Swan explains.