Navigation Links
Is 'Improved' Vaccine Causing Whooping Cough Outbreaks?
Date:8/1/2012

By Steven Reinberg
HealthDay Reporter

TUESDAY, July 31 (HealthDay News) -- A change in vaccine composition may partly explain current whooping cough outbreaks in the United States and Australia, researchers say.

In the 1990s, a switch was made from diphtheria-tetanus-whole cell pertussis (DTwP) vaccine to diphtheria-tetanus-acellular pertussis (DTaP) vaccine to reduce side effects. It's possible that the newer vaccine is less effective and wears off faster, Australian researchers suggest.

"Our findings don't change the fact that vaccinations remain the best way to prevent whooping cough," said lead researcher Stephen Lambert, an associate professor at the Queensland Children's Medical Research Institute of the University of Queensland in Brisbane.

"Children who develop pertussis [whooping cough] despite being vaccinated have milder symptoms, reduced duration of illness and are less infectious to others than children who have not received their vaccines," he added.

Moreover, doctors shouldn't exclude whooping cough as a diagnosis just because a child has had all of the recommended vaccines, Lambert said.

Whooping cough -- so-called because of the distinctive crowing sound or "whoop" it causes -- is highly contagious. More than twice as many cases have been reported in the United States so far this year compared to last year, and already nine babies have died, according to the U.S. Centers for Disease Control and Prevention. "We may be on track for a record-high pertussis rate this year," Dr. Anne Schuchat, director of the CDC's National Center for Immunization and Respiratory Diseases, said recently.

For the study, published in the Aug. 1 issue of the Journal of the American Medical Association, Lambert's team collected data on more than 58,000 Australian children born in 1998. More than 40,000 of them received three doses of a pertussis vaccine.

Children who received the DTaP vaccine had higher rates of whooping cough than those who got the DTwP vaccine, the investigators found.

Among those who received mixed vaccines, the rates of whooping cough were highest among children receiving DTaP as their first dose, they noted.

"Our findings go some way to explaining why we are currently seeing a resurgence of pertussis in Australia and the U.S., and in particular why rates are higher in some age groups compared to others," Lambert said.

In switching to a different vaccine, "we may have traded off some of the protection whole-cell vaccines provided for the better safety profile, with many fewer adverse events, seen with acellular vaccines," Lambert suggested.

The earlier vaccine caused pain and swelling at the injection site. Also, rare adverse brain effects occurred in some children, although it's not known if the vaccine was the direct cause.

Dr. Thomas Clark, a medical epidemiologist at the CDC, said the acellular vaccine was introduced because of those concerns. "What we know now is that the whole-cell vaccines were probably a little better than the acellular vaccines," he said.

The open question is how long the vaccine remains effective, Clark added.

While most older children and adults have few problems with whooping cough, infants are at great risk because their airway is underdeveloped. Vaccination can't take place until a child is 2 months old and they're not well protected until the third dose at 6 months of age, which is why the CDC urges pregnant women and anyone who comes into contact with infants to be vaccinated. For women who get vaccinated during pregnancy, the mother's immunity may protect her baby before he's old enough to get his own vaccines, Clark added.

The vaccine's immunity wears off over time so children should get a booster at age 11 or 12, and adults need one dose, too, Clark said.

So far this year almost 19,000 cases of pertussis have been reported in the United States. Washington state has been particularly hard hit. Noting that these are reported cases, Clark said there could actually be 1 million to 1.5 million people with pertussis in the United States. Most of these undiagnosed cases are mild, he noted.

Clark urges everyone, including adults, to get vaccinated. "It's the best protection against the disease," he said. "We used to have upwards of 10,000 deaths a year," he pointed out.

Vaccination rates among children and adolescents are high, but the rate for adults is only about 8 percent, he said.

More information

For more information on whooping cough, visit the U.S. Centers for Disease Control and Prevention.

SOURCES: Stephen Lambert, Ph.D., associate professor, Queensland Children's Medical Research Institute, University of Queensland, Brisbane, Australia; Thomas Clark, M.D., medical epidemiologist, U.S. Centers for Disease Control and Prevention; Aug. 1, 2012, Journal of the American Medical Association


'/>"/>
Copyright©2012 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. Improved Stem Cell Line May Avoid Tumor Risk: Study
2. Staging and risk stratification of thyroid cancer improved with SPECT/CT
3. Reported increase in older adult fall deaths due to improved coding
4. Ketamine improved bipolar depression within minutes
5. Exercise program improved health of lung transplant patients and cut cardiovascular risk
6. GMCSF treatment associated with improved cognition in cancer patients
7. PaleoMeal Organic Whey Protein Formula Improved According to Rockwell Nutrition
8. Analysis of KRYSTEXXA phase III data demonstrates improved health-related quality of life and physical function in refractory chronic gout patients
9. Expanding Medicaid to low-income adults leads to improved health, fewer deaths
10. Study Suggests Vaccine May Help Kids With Brain Cancer
11. Young girls more likely to report side effects after HPV vaccine
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Is 'Improved' Vaccine Causing Whooping Cough Outbreaks?
(Date:2/13/2016)... ... February 13, 2016 , ... ... Data Management Solution Providers list for its expertise in eClinical Solutions. DDi has ... to serve the technology needs of global clients. DDi provides smarter technology for ...
(Date:2/12/2016)... ... February 12, 2016 , ... The law firm of ... Evangeline Parishes. The purpose of these scholarships is to encourage applicants to pursue ... to seek employment within these two parishes. , “We have available jobs in ...
(Date:2/12/2016)... Falls Church, VA (PRWEB) , ... February 12, 2016 , ... CDRH Enforcement Trends: , ... http://www.fdanews.com/cdrhenforcementtrends , As Winston Churchill said, “Those who don’t learn ... 2015 will show what to expect when they come knocking this year. But that takes ...
(Date:2/12/2016)... ... February 12, 2016 , ... As a former television ... a demanding job, and no time to decompress, Rabinowitz found herself drawn to a ... meditation for its impact on her life, implementing a 20-minute-per-day meditation practice with her ...
(Date:2/12/2016)... ... 12, 2016 , ... The ThedaCare Center for Healthcare Value ... on April 5-7. The series is a multi-day, multi-workshop event designed to teach ... a broad range of topics, including coaching skills, the scientific method of problem ...
Breaking Medicine News(10 mins):
(Date:2/12/2016)... 12, 2016 ... http://www.sedar.com ) und der ... abrufbar.    --> http://www.sedar.com ) ... http://www.telestatherapeutics.com abrufbar.    --> ... seinen Konzernabschluss des zweiten Quartals und ...
(Date:2/12/2016)... HOUSTON , Feb. 12, 2016  Memorial Hermann ... center Dwight Howard to bring a one-of-a-kind ... Hospital . Using cutting-edge technologies such as 360-degree video ... kids both virtually, then literally – giving the patients ... – and it was all caught on video ...
(Date:2/12/2016)... 2016  Eli Lilly and Company (NYSE: LLY ) ... (pemetrexed disodium) vitamin regimen patent would not presently be infringed ... France , Italy and ... only with dextrose solution.  --> ... of Appeal held that Lilly,s patent would be indirectly infringed ...
Breaking Medicine Technology: