Phase 1: No infections in humans are being caused by viruses circulating in animals. 
Phase 2: Animal flu virus causes infection in humans, and is a potential pandemic threat.
Phase 3: Flu causes sporadic cases in people, but no significant human-to-human transmission.
Phase 4: Human-to-human transmission and community-level outbreaks.
Phase 5: Human-to-human transmission in at least two countries. Strong signal pandemic imminent.
Phase 6: Virus spreads to another country in a different region. Global pandemic under way.
POST-PEAK: Pandemic activity appears to be decreasing though second wave possible.Post-pandemic: activity returns to normal, seasonal flu levels.
POST-PEAK: Pandemic activity appears to be decreasing though second wave possible.Post-pandemic: activity returns to normal, seasonal flu levels.
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