Theres been an outbreak of a rare and deadly strain of swine flue in Mexico. Mexican authorities report 20 deaths from swine flu and said authorities were investigating 40 more possible fatalities and 943 possible infections. The World Health Organization went on high alert today, because there have been outbreaks in multiple communities in Mexico. The flu-like symptoms resemble those of regular human influenza, including fever, lethargy, coughing and nausea except there is no human vaccine for swine flu. Authorities in Mexico have launched a huge campaign to prevent the spread of the virus, including closing schools and urging people to avoid contacts in public. The concern of the World Health Organization is amplified because "the viruses characterized in this outbreak have not been previously detected in pigs or humans."