When Omicron burst onto the scene late last year, scientists were shocked at how many mutations it had compared to previous variants.
We now know that it's way more transmissible than previous variants and less nasty than Delta, although that hasn't stopped it from causing a lot of severe disease and death.
But biology isn't static and Omicron has continued to evolve. First came BA1, then came a new wave of BA2 and now we're starting to see another new subvariant: BA4.
So on today's Coronacast, what is BA4, where did it come from and how much of a worry is it?
Also on today's show:
* What's going on with the hepatitis condition in kids? Is it being caused by COVID-19?
Can you train yourself to sleep less?
Why everything hurts when you turn 30
Can sudoku really keep your brain younger for longer?
A single glass of red wine for your health, yeah or nah?
Your emotional support water bottle is probably too big
How can you boost your immune system?
Is it safe to dose yourself with pre-workout?
How do over-the-counter painkillers compare?
Restless Legs Syndrome and how it's treated
Kate's cancer announcement: What do we know about her health?
Is your (artificial) sweet tooth killing you?
Pimples, spots and pleuks: The who, why and what (to do)
Why are mosquitoes so attracted to me?
We're doing a live show! Bring your rash to Brisbane March 22
Are hormones hindering your workout?
Why do we have wisdom teeth?
Multivitamins: Are they a scam?
Are chiropractors charlatans or misunderstood?
Does anti-ageing skincare actually work?
What's the deal with night terrors?
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