[Photo by JONATHAN VALANIA] UPDATE: Mexico says the World Health Organization has raised its pandemic alert for swine flu by one level, two steps short of declaring a full-blown pandemic. Mexico health department spokesman Carlos Olmos confirms the move. WHO says the phase 4 alert means sustained human to human transmission causing outbreaks in at least one country. It signals a significant increase in the risk of a global epidemic, but doesn’t mean a pandemic is inevitable. Many experts think it may be impossible to contain a flu virus already spreading in several countries. BBC: Governments around the world have […]