Navigation Links
Malaria Vaccine Effective in Latest Trials
Date:12/8/2008

Mosquito-borne disease kills nearly 1 million people, mostly African children, every year

MONDAY, Dec. 8 (HealthDay News) Results from two phase II trials in Africa show that a new malaria vaccine is effective at preventing both infection and the mosquito-borne disease itself in infants and children.

"Malaria is killing almost 1 million people, mostly African children, every year," Dr. Christian Loucq, director of the PATH Malaria Vaccine Initiative, said during a morning teleconference Monday. "Clearly, the world needs a safe and effective malaria vaccine."

The vaccine, called RTS,S, is one of several vaccine candidates for malaria, Loucq said. Other vaccines are under development, but RTS,S is the one that is furthest along and ready for phase III testing, he noted.

"These studies offer further evidence that RTS,S provides both infants and young children with substantial protection against the disease," Loucq said. "We are closer than ever before to having a malaria vaccine for use by the children in Africa."

The findings were published online Dec. 8 in the New England Journal of Medicine.

RTS,S was developed by drugmaker Glaxo-Smith-Kline. When the shot is given it also has another component, called either ASO1 or ASO2, which is given to boost the vaccine's effectiveness.

In one study, 340 Tanzanian infants under 1 year old received the RTS,S/ASO2 vaccine along with other vaccines for diphtheria, tetanus, pertussis and heamophilus influenzae B.

"There was a 65 percent reduction in first infection from malaria in those infants who received three doses of the vaccine and were followed over a six-month period," said lead researcher Dr. Salim Abdulla, head of the Bagamoyo Research and Training Centre of the Ifakara Health Institute, in Tanzania. "A safe and efficacious malaria vaccine for children in Africa may be available in the near future and have the potential of alleviating a huge burden of malaria disease," he added.

The researchers also found that RTS,S/ASO2 could be safely and effectively given along with other childhood vaccines. The malaria vaccine did not interfere with the protective responses of other vaccines. And the effectiveness of the RTS,S malaria vaccine wasn't compromised by the other vaccines, Abdulla said.

In the second study, 894 children in Kenya and Tanzania, ages 5 to 17 months, were given either three doses of the malaria vaccine or a rabies vaccine. The researchers found a 53 percent reduction in the risk of developing malaria among children who received the RTS,S vaccine.

"If these findings were replicated in a Phase III multi-center study, we would expect that study to lead to an application for a license for RTS,S/AS01 as a vaccine to prevent clinical malaria," said lead researcher Philip Bejon, of the Kenya Medical Research Institute (KEMRI)-Wellcome Collaborative Research Programme and the Centre for Tropical Medicine at the University of Oxford, in England.

"The vaccine would be only partially effective, but may still be a useful addition to malaria control programs," Bejon added.

The differences in the results of the two trials can be explained by what the researchers were looking for. In the first trial, the scientists looked for the presence of malaria in the infants' blood; in the second trial they looked for children who actually went on to develop the disease.

It's unclear how long the vaccine would be effective. But, in a four-year follow-up of children given the vaccine in Mozambique, the inoculation remained effective in preventing most cases of malaria, Loucq said.

Phase III trials of the vaccine are set to begin early next year, he said.

The vaccine trials were funded by a grant from the Bill & Melinda Gates Foundation to the PATH Malaria Vaccine Initiative, and drug maker GlaxoSmithKline.

Dr. Marc Siegel, an expert in infectious diseases and an associate professor of medicine at New York University School of Medicine, agreed that there was an urgent need for a malaria vaccine.

"Malaria is a huge worldwide problem infecting from 300 to 500 million people a year and killing more than a million worldwide," Siegel said. "In the U.S. we don't give it the attention it deserves. The new vaccine is very exciting, and highly worthy of our attention and support."

Two other reports in the same journal issue looked at the effectiveness of malaria drugs in different parts of the world.

In one report, researchers wanted to see if there were new strains of malaria resistant to artesunate, a common drug used to treat the disease. For the study, 56 people in Cambodia given the anti-malaria drug artesunate responded to treatment, indicating there were no strains of malaria resistant to the drug, the researchers said.

In the second report, 482 children with malaria in Papua New Guinea were randomly assigned to a combination of anti-malaria drugs. The researchers found that the most effective pairing was the combination of artemether-lumefantrine, which had a response rate of 95.2 percent against the malaria strain, called P. falciparum.

And in a report published online Dec. 8 in The Lancet, researchers found that the rectal application of artesunate was effective in treating children with malaria. The rectal application could be important because in severe cases of malaria patients cannot swallow or keep medicine down.

More information

For more on malaria, visit the U.S. Centers for Disease Control and Prevention.



SOURCES: Dec. 8, 2008, teleconference with Christian Loucq, M.D., director, PATH Malaria Vaccine Initiative; Salim Abdulla, M.D., Ph.D., leader, Bagamoyo Branch, Ifakara Health Institute, Bagamoyo, Tanzania; Philip Bejon of Kenya Medical Research Institute (KEMRI)-Wellcome Collaborative Research Programme and the Centre for Tropical Medicine, University of Oxford, England; Marc Siegel, M.D., associate professor of medicine, New York University School of Medicine, New York City; Dec. 8, 2008, New England Journal of Medicine, online; Dec. 8, 2008, The Lancet, online


'/>"/>
Copyright©2008 ScoutNews,LLC.
All rights reserved

Related medicine news :

1. Promising trials of malaria vaccine lead to calls for Phase 3 development
2. Canada Supports Ground-Breaking Malaria Treatment Program in Sub-Saharan Africa
3. Bed net usage increases, but 90 million African children still exposed to malaria
4. Airport malaria -- cause for concern in the US
5. Malaria No More Congratulates President-elect Obama and the New Congress and Urges Them to Uphold Their Strong Commitment to Eliminating Malaria
6. Genetic Research Offers Insights Into Form of Malaria
7. Marathon and Partners Announce $28 Million, 5-Year Extension of Life Saving Malaria Control Project in Equatorial Guinea
8. Nanobiotix and BiotechCorp Announce Initial Focus of Their Collaboration: P-O-C Diagnostics and Drug Delivery Systems for Tropical Diseases, Such as Malaria
9. Study: Delaying evolution of drug resistance in malaria parasite possible
10. Malaria No More Names Scott Case Chief Executive Officer
11. FC Barcelona & FCB Foundation, Malaria No More and AYSO Launch Initiative to Kick it to Malaria
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/13/2017)... ... ... As health professionals work to improve their approach to healthcare, there is ... than filling out a survey; in many cases health professionals and patients are working ... and research on the importance of active engagement with patients and members of the ...
(Date:10/13/2017)... ... ... The American Board of Family Medicine's (ABFM) Board of Directors has selected ... Dr. James C. Puffer upon his retirement. Dr. Newton will serve in the position ... the end of 2018. Upon assuming the role of President and CEO on January ...
(Date:10/13/2017)... Nevada (PRWEB) , ... October 13, 2017 , ... ... Hemp CBD Oil utilizing Purzorb™ technology. Applying the Purzorb™process to full spectrum CBD oil ... required and providing a CBD form that can be easily incorporated into liquid products, ...
(Date:10/13/2017)... ... , ... Lori R. Somekh, founder of the Law Office of Somekh ... law and special needs planning attorneys. “Membership in ElderCounsel helps our office remain up ... network with elder law attorneys nationwide,” said Somekh. , ElderCounsel was ...
(Date:10/13/2017)... ... 13, 2017 , ... Many families have long-term insurance that covers care for ... a waiver for care if the client has a cognitive impairment diagnosis. , ... care, is often waived, so the benefits from their insurance start immediately,” said Mechell ...
Breaking Medicine News(10 mins):
(Date:10/4/2017)... the Centers for Disease Control and Prevention (CDC), influenza vaccination should ... helping communities across Massachusetts , Connecticut ... shots through the end of the month. *Some exclusions apply ... ... is by the end of October, according to the Centers for Disease ...
(Date:10/2/2017)... Fla. , Oct. 2, 2017  AllianceRx Walgreens ... company formed by Walgreens and pharmacy benefit manager Prime ... its new brand, which included the unveiling of new ... , as well as at a few other ... the new brand to patients, some of whom will ...
(Date:9/28/2017)... WASHINGTON , Sept. 28, 2017 Cohen ... to advance the use of wearable and home sensors ... brain disorders. Early Signal Foundation, a nonprofit organization focused ... populations, will provide an affordable analytical system to record ... ...
Breaking Medicine Technology: