HealthExpert analysis: Mexican swine flu – the story so far Why have most of the deaths from the new H1N1 flu virus been in Mexico? How deadly is it? What do its genes tell us? Flu virus expert Wendy Barclay gives Âé¶¹´«Ã½ her opinion Comment
EarthWhich virus will birds give us next? One common form of cold virus turns out to have started in birds – and the discovery is helping to show how animal viruses spread to people News