Health and Healthcare Systems
Here's how much immunity we get after a COVID-19 infection
Researchers set out to discover how much natural immunity a person can acquire if infected by COVID variants - and how long such immunity lasts.
Researchers set out to discover how much natural immunity a person can acquire if infected by COVID variants - and how long such immunity lasts.
The UK has declared a national incident after repeatedly detecting polio in London. Vaccines have helped eliminate polio, but the vaccinated can catch it.
