U.S. whooping cough outbreak could be worst in half century

SEATTLE Fri Jul 20, 2012 1:14am EDT

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SEATTLE (Reuters) - The number of U.S. whooping cough cases has risen to around 18,000 in an outbreak that is on track to become the most severe in over a half century and could in part stem from possible waning vaccine protection, health officials said on Thursday.

Washington state, which declared an epidemic in April, and Wisconsin were particularly hard hit, with each reporting more than 3,000 cases, according to the U.S. Centers for Disease Control and Prevention.

Nine people have died overall and the number of cases was already more than double than at the same time last year.

Whooping cough, also known as pertussis, causes severe, almost uncontrollable coughing. In the United States, most children are immunized with a DTaP five-dose series vaccine that is given as a series of shots, starting at two months.

All adults, including pregnant women, should get a booster shot because the contagious illness is especially dangerous for children under a year old who have yet to complete a cycle of vaccinations, Dr. Anne Schuchat, director of the CDC's National Center for Immunization and Respiratory Diseases, told a media briefing.

"It's most dangerous for babies," Schuchat said, adding that the current outbreak at its existing pace could become the most severe since 1959, when 40,000 cases were reported. "Preventing infant deaths from the disease is our primary national goal," she said.

A spike in whooping cough cases among 10-year-olds and adolescents who are 13 and 14 was a concern, perhaps an indicator that the pertussis vaccine may be wearing off earlier than anticipated, Washington Health Secretary Mary Selecky said.

The U.S. groups of 10-, 13- and 14-year-olds who are experiencing a high illness rate had DTaP vaccinations, which were introduced in 1997 at the same time that the prior DTP vaccine was discontinued.

The earlier vaccine used whole cell parts made of killed pertussis bacteria, while DTaP uses only small acellular bacteria pieces, not the whole bacteria cell, said Donn Moyer, Washington state Health Department spokesman

CDC officials will begin an investigation in Washington state later this month "to analyze our data for cases among 13- to 14-year-olds to see what can be learned about disease rates and vaccination status," Moyer told Reuters.

The number of cases in Washington, with no deaths, has tripled since April, with 1,132 cases reported by the end of that month.

Moyer said the CDC also plans a similar study in California, where a 2010 epidemic counted more than 9,000 cases, including 10 infant deaths.

Whooping cough typically begins with cold-like symptoms such as a fever, runny nose and sneezing and is accompanied by a mild cough that grows more severe by the first or second week. A high-pitched whoop, giving the illness its name, can follow violent coughing fits.

This year, Australia is experiencing a high rate of whooping cough, Schuchat said.

(Editing by Cynthia Johnston and Philip Barbara)

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Comments (3)
harryn wrote:
The first comment is not relevant to this article but the fact that WA DOH is in the fog about the situation is even more of a problem. Please see http://blog.seattlepi.com/naturalnotes/2012/04/04/can-we-please-hear-both-sides/ to get a better perspective on what can be done to prevent this from continuing.

Jul 20, 2012 12:18pm EDT  --  Report as abuse
harryn wrote:
The first comment to this article is not relevant and may have racial overtones as well as offensive to some.

For a better perspective on this situation, which is certainly not present at WA DOH, read Can We Please Hear Both Sides. This article can be found on the Seattle PI web site under blogs, “Natural Notes”. In fact Laura L. Meyers should read it and look in to more balanced reporting.

Jul 20, 2012 12:22pm EDT  --  Report as abuse
shawmutt wrote:
Let’s try to avoid the woo in the comments. Before recommending someone takes vitamins for a vaccine preventable disease, show some science to back it up. Throwing up some graphs to make it “sciency” and whining about not having your side of the story shown is malarkey.

You may be content with the hand waving comment about how tragic deaths from a vaccine preventable disease are, I however am not. I can’t help but think of Dana Mccaffery http://danamccaffery.com/openletter.html, an infant that died of a vaccine preventable illness due to low vaccination rates where she lived. Perhaps you can dismiss this with hand waving and a couple vitamin C pills. I cannot.

Ask you doctor for a booster–you may get it and be fine, the infant you give it too may not.

Jul 23, 2012 5:56pm EDT  --  Report as abuse
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