California authorities confirmed an eighth case of swine flu on Monday and were investigating 12 other possible cases, state health officials said.
The eighth case was a seventh grader in Sacramento County who has already recovered from mild symptoms of the illness, said Al Lundeen, a spokesman for the California Department of Public Health. The department did not make public the town where the boy lives or the name of the private school he attends.
Maria Whipple of San Diego wore a surgical mask as she returned to San Diego from doing business in Tijuana.
"People think this is a joke. It's not a joke. I'm worried about it," she said.