Without improvements to New Zealand's 'makeshift' border quarantine system the risk of further community cases of COVID-19 variants remains high.
A variant with a higher transmission rate is much more dangerous than one with just a higher fatality rate.
A virus that is 30% more transmissible is more deadly than a virus that is 30% more deadly. Counter-intuitive but true.
New variants will push the number needed to reach herd immunity up.
Even if some places reach herd immunity, the virus is unlikely to disappear.
How the lessons learned from the global financial crisis can transform our view of COVID risk.
The latest REACT study provides some reassurance, but there is significant uncertainty in the numbers.
We'll achieve herd immunity when 60% of the population is immune to COVID. No, wait, make it 70%. Or is it 80%?
The R number fluctuates more as case numbers fall.
Germany's resurgent R number is largely down to a localised outbreak.
K is all about the super-spreaders.