A 9-year-old girl in Imperial County and a 10-year-old boy in San Diego County were identified as suffering from swine flu. Both have recovered, but health officials remain puzzled because neither had been in contact with pigs and the strain was one never identified in the U.S.
http://latimesblogs.latimes.com/lanow/2009/04/new-strain-of-swine-flu-found-in-san-diego-imperial-counties.html