How the Wuhan coronavirus causes severe illness ...
... among other things lung damage, pneumonia and multi-organ failure, or sepsis.
A guide to flu vaccines
The adjuvanted flu vaccine is free for over-65s and offers better protection than the standard vaccine. Here's what the research says.
New flu vaccines for the over-65s
Two free flu vaccines will improve protection for older people, but like those already available, they're not perfect.