Mexico City, Apr. 28: The World Health Organization has raised the alert level in relation to the `Swine Flu’ epidemic to Phase 4, meaning there is sustained human-to-human transmission of the virus causing outbreaks in at least one country.
On Monday, the alert was raised above Phase 3.
Putting an alert at Phases 4 or 5 signals that the virus is becoming increasingly adept at spreading among humans.
Phase 6 is for a full-blown pandemic, characterized by outbreaks in at least two regions of the world.