The World Health Organization (WHO) has raised its Influenza Pandemic Phase from 4 to 5. That's DEFCON 2 going on 1 for those who speak militarese. According to the WHO website:
Phase 5 is characterized by human-to-human spread of the virus into at least two countries in one WHO region. While most countries will not be affected at this stage, the declaration of Phase 5 is a strong signal that a pandemic is imminent and that the time to finalize the organization, communication, and implementation of the planned mitigation measures is short.
Serious stuff. How serious? Remember how the martians died in The War of the Worlds? It's that serious.