What we know about Omicron

South Africa and Omicron

On early-warning systems

Pandemic Snapshot

The science and politics of boosters

The spectre of a poor-country debt crisis

music festival crowds

Herd immunity

COVID lessons for climate

Could we replicate the vaccine breakthrough to tackle the even greater threat of climate change? This analysis looks at how and where the winning vaccine formula might be deployed in the race to stop our planet overheating.