Today, WHO has signaled warning to all nations worldwide for the Swine flu outbreak. It has potential to become an pandemic. The origins of this new strain remain unknown. One theory is that Asian and European strains traveled to Mexico in migratory birds or in people, then combined with North American strains in Mexican pig factory farms before jumping over to farm workers. Originating in Mexico this time, swine flu has caused more than 100 deaths there and moved to the US, where more than a dozen children in New York are found to have caught it after a visit to Mexico. There are reports also coming in from Spain and even as far off as New Zealand now. Unconfirmed or suspected cases The US declared a public health emergency on Sunday as a precautionary measure. A top official at the Centers for Disease Control and Prevention, or CDC, said she feared there would be deaths in the US as the new strain of flu spreads. Mexican health officials have said that the original disea...