It's sometimes easy to forget that the COVID-19 pandemic affects more than just physical health. It also taken a massive toll on mental health.

And according to some new research, the two pandemic factors that lead to the worst mental health outcomes are rising case numbers and lockdowns.

Globally, the most affected groups are young people and women, and poorer countries in particular have seen higher mental health burdens.

Also on today's show:

* Why do some people get sicker from COVID than others?

* You seem confident we will get booster shots but I heard Dr Paul Kelly sat last week that there is evidence to suggest not - that the vaccine may even last a lifetime? Did I hear incorrectly?

* I live in a rural community and regularly drive past the sewerage works. The smell is often very noticeable. Is there a risk of virus carrying aerosol droplets leading to catching COVID?