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A pig having its snout swabbed to test for viruses

Health

People in the US passed swine flu to pigs nearly 400 times in 12 years

A particular strain of swine flu was first recorded in people in 2009. Since then, humans have passed the strain to pigs at least 370 times in the US

A coloured scanning electron micrograph of a cell (green) infected with the omicron variant of the coronavirus (purple)

Health

The omicron coronavirus variant may protect against flu

A pig, the animal from which the swine flu (H1N1) originated

Swine flu (H1N1)

Pork being sold in a market in Beijing, China

Life

China has 50 per cent fewer pigs – but how many of them actually died?

A hospital full of people with flu

Health

Pandemics past: Seven times flu has become a mass killer

An ill woman sneezing

Health

Bad colds may have delayed this year’s flu epidemic in UK

Health

Hidden viral protein brings universal flu jab closer

Earth

New Urbanist: Our infrastructure is expanding to include animals

Health

How scared should we be of lab-created flu outbreaks?

Health

Google Flu Trends gets it wrong three years running

The search giant's much-hyped flu tracker has been way out on its predictions for years – raising concerns over our reliance on big data

Health

Virus that caused flu pandemic dominates again

Health

Flu vaccine helps unravel complex causes of narcolepsy

Health

US shutdown threatens response to disease outbreaks

Health

Evidence that Tamiflu reduces deaths in pandemic flu