ATLANTA (AP) -- About one in 13 U.S. swine flu deaths have been children, and most of the kids have been of school age, the federal government said Thursday in its first study of the new flu's youngest victims.
More than 40 U.S. children have died from the virus since it was first identified in this country in April. The report from the U.S. Centers for Disease Control and Prevention takes a comprehensive look at the first 36 deaths, and found some important differences in the pediatric death toll from swine flu as compared to seasonal flu:
Swine flu has caused more than 1 million illnesses in the United States, the CDC estimates. More than 550 deaths and 8,800 hospitalizations have been reported to date.
It's hard to say whether children have accounted for a higher proportion of deaths from swine flu than they normally do from seasonal flu, though CDC officials say that seems to be true. The CDC doesn't monitor seasonal flu deaths as closely as it does swine flu, and it has no comprehensive count of annual seasonal flu deaths to enable such a comparison.
The new report focuses on lab-confirmed swine flu deaths reported through Aug. 8. The CDC hasn't been able to do as complete an analysis of cases that have come in since then, said Dr. Cynthia Moore, a CDC medical officer who was one of the study's co-authors.
Through Aug. 8, there were 477 total swine flu deaths, including 36 in children. Only about 20% of those children were age 4 or younger. That's unusual: Often 50% or more of seasonal flu deaths are in infants and toddlers, who have less mature immune systems and smaller air passages and are generally in more danger from respiratory infections.
"There's a lot of school-aged children" in the death count, said Dr. Beth Bell, a CDC epidemiologist who is a leader in the agency's swine flu response efforts.
It's not clear why such a large percentage of the swine flu pediatric deaths are in kids aged 5 and older. It simply may be because older children were more likely to encounter the virus -- at schools, summer camps -- than very young children who spend more time at home, Bell said. The initial numbers in the report are small and the CDC will need to look at more reports to see if the trends hold up, CDC officials said.
The CDC released the report through one of its publications, "Morbidity and Mortality Weekly Report."