Possibility Probed That Swine Flu Originated in Border Region

Doctors tracking swine flu in California are investigating a new theory: What if it didn't originate in Mexico but instead had been floating around the border region for months?

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Growing evidence in California suggests that early flu cases had no apparent origin in Mexico. Many of the early California victims — including the first two cases — say they hadn't traveled to Mexico and had no contact with pigs. Some may have fallen ill before the first Mexicans did. Those cases contradict the conventional understanding of how the strain originated. They could also offer important clues about the future trajectory of the disease. Other cases here and in other states, as well as abroad, have clear links with Mexico. More...