2012 was worst year for whooping cough since 1955
The nation just suffered its worst year for whooping cough in nearly six decades, according to preliminary government figures.
In Vermont, one of the states hardest hit by pertussis or whooping cough, the state Health Department offered free vaccines at a dozen clinics around the state last month to prevent the spread of the illness. The state paid $70,000 for vaccinations.
The Health Department reported that more than 500 Vermonters, most of them ages 10 to 14, had been infected in 2012 — 10 times the number reported the year before.
“These are epidemic numbers for our small state,” state Health Commissioner Dr. Harry Chen said at the time.
“Despite our best collective efforts, whooping cough is spreading throughout the state,” Chen said. “That’s because it’s a highly contagious bacterial infection that’s easily spread from person to person from simple things like coughing, sneezing and even talking to one another.”
Whooping cough ebbs and flows in multi-year cycles, and experts say 2012 appears to have reached a peak with 41,880 cases. Another factor: A vaccine used since the 1990s doesn’t last as long as the old one.
The vaccine problem may continue to cause higher than normal case counts in the future, said Dr. Tom Clark of the Centers for Disease Control and Prevention.
“I think the numbers are going to trend up,” he said. The agency provided the latest figures Friday.
Last year, cases were up in 48 states and outbreaks were particularly bad in Colorado, Minnesota, Washington state, Wisconsin and Vermont.
The good news: Despite the high number of illnesses, deaths didn’t increase in 2012. Eighteen people died, including 15 infants younger than age 1.
Officials aren’t sure why there weren’t more deaths, but think that the attention paid to bad outbreaks across the nation resulted in infected children being diagnosed faster and treated with antibiotics.
Also, a push last year to vaccinate pregnant women — a measure designed to pass immunity to infants — may have had some small measure of success, Clark said.
The final tally will be higher but unlikely to surpass the nearly 63,000 cases in 1955, he said.
Whooping cough is a highly contagious disease that can strike people of any age but is most dangerous to children. Its name comes from the sound children make as they gasp for breath.
It used to be a common threat, with hundreds of thousands of cases annually. Cases gradually dropped after a vaccine was introduced in the 1940s.
For about 25 years, fewer than 5,000 cases were reported annually in the U.S. But case counts started to climb again in the 1990s although not every year. Numbers jumped to more than 27,000 in 2010, the year California saw an especially bad epidemic.
Experts looking for an explanation have increasingly looked at a new vaccine introduced in the 1990s, and concluded its protection is not as long-lasting as was previously thought.
Children are routinely vaccinated with five doses beginning at 2 months, and a booster shot is recommended at around 11 or 12. Health officials are considering recommending another booster shot, strengthening the vaccine or devising a brand new one.
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