Two California children were diagnosed with a unique type of swine flu, and the cases are being investigated by the federal Centers for Disease Control and Prevention.
A 10-year-old boy in San Diego County and a 9-year-old girl in neighboring Imperial County were diagnosed last week, and both have recovered, the Associated Press reported.
The CDC is determining the genetics of the virus in these two cases and trying to track down and test people who may have had contact with the children. However, the agency said there's no reason for the public to take special measures to protect themselves.
Both children, who had no contact with each other, became sick in late March, the AP reported. The boy's mother and brother, and the girl's brother and cousin, also had flu-like illnesses recently, but weren't tested for flu while they were sick.
More than a dozen cases of human swine flu virus infections have been reported in the United States since late 2005. Prior to that, about one case was reported to the CDC every one or two years.