Governmental and inter-governmental agencies with reliable info:
World Health Organization – latest swine flu news.
Health Protection Agency – the source for UK info: some for everyone, some for health professionals.
Department of Health – the UK’s governmental branch for health
Center for Disease Control – the US equivalent of the HPA. Twitter username: CDCEmergency.
NHS Choices – Information on infection control measure for the general public
Guidance for doctors by doctors:
BMA – the British Medical Association’s list of resources