News / Health

Experimental Malaria Vaccine Weakens Parasite

A young girl with malaria rests in the inpatient ward of the Malualkon Primary Health Care Center in Malualkon, in the South Sudanese state of Northern Bahr el Ghazal, June 1, 2012.
A young girl with malaria rests in the inpatient ward of the Malualkon Primary Health Care Center in Malualkon, in the South Sudanese state of Northern Bahr el Ghazal, June 1, 2012.
Jessica Berman
Scientists are developing a vaccine against malaria that is designed to limit the illness in children who have been bitten by mosquitoes carrying the disease-causing organism.  They have discovered a protein that is essential for malaria parasites to cause severe illness.

With the protein, called SEA, the parasite is able to burst through infected red blood cells, ramping up disease symptoms. But malaria parasites deprived of SEA are trapped inside the cells where they wither away and are eventually eliminated from the body by the spleen.  

Researchers at Brown University in Providence, Rhode Island, and Boston Children’s Hospital in Massachusetts discovered the protein.  

Jonathan Kurtis is director of the Center for International Health Research at Rhode Island Hospital and lead author of the study which appears in the journal Science.

Kurtis says an experimental vaccine containing antibodies against the parasitic protein was developed and tested in mice.  Rodents that received the vaccine were only mildly sick and had fewer parasites in their bodies than untreated mice.

Next, Kurtis says investigators measured levels of antibodies to the SEA protein in a group of 785 Tanzanian children.

“And children with antibodies to our protein never got severe malaria - there were zero cases - as compared to children who did not have antibodies to our protein,” Kurtis said.
 
Malaria mortality rates, 2000 - 2012Malaria mortality rates, 2000 - 2012
x
Malaria mortality rates, 2000 - 2012
Malaria mortality rates, 2000 - 2012
Researchers then analyzed blood samples collected in 1997 from 140 children in Kenya.  Investigators found there were 50 percent fewer parasites in the serum of youngsters that produced antibodies to SEA during a high transmission season.  As with the Tanzanian children, there were also no severe cases of the disease in children with antibodies against the protein, according to Kurtis.

“And so the thought is by immunizing people with the SEA proteins, so that they make their own antibodies, they’ll be protected,” he added.

The next step, Kurtis says, is to test a laboratory-made SEA vaccine to see whether it works in primates.

Kurtis says he’s excited that researchers may be on the verge of an effective drug that lessens the severity of a malaria infection, but he’s also humbled.

“Our eye has to be on the prize.  And the prize is - you’ve got a child every 15 seconds, just during this phone conversation, you know dozens and dozens of children have died of malaria,” Kurtis said. "It’s just unbelievable.”

If the vaccine proves to be safe and effective in monkeys within the next  year, researchers expect they’ll move quickly to human vaccine trials.  

Kurtis says the goal eventually is to immunize youngsters in malaria-endemic regions at the same time they are vaccinated against other childhood illnesses.

You May Like

Australia-Cambodia Resettlement Agreement Raises Concerns

Agreement calls for Cambodia to accept refugees in return for $35 million in aid and reflects Australia’s harder line approach towards asylum seekers and refugees More

India Looks to Become Arms Supplier Instead of Buyer

US hopes India can become alternative to China for countries looking to buy weapons, but experts question growth potential of Indian arms industry More

Earth Day Concert, Rally in Washington

President Obama also took up the issue Saturday in his weekly address, saying there 'no greater threat to our planet than climate change' More

This forum has been closed.
Comment Sorting
Comments
     
by: Donald Fraser Miles from: Elliot Lake, Canada
May 24, 2014 8:36 AM
My own theory on malaria which I communicated years ago is that the male mosquito creates protection against the malaria parasite. Only female mosquitos bite. It may be that the female mosquito bites in part to offload the malaria parasite from its own body. Male mosquito sex hormones may protect against or kill the malaria parasite. This is a theory which has had the opportunity to be tested. No confirmation of this theory has occurred. Thus it may not be correct. However, it is my theory on malaria.

Featured Videos

Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
Are Energy Needs Putting Thailand's Natural Beauty at Risk?i
X
Steve Sandford
April 17, 2015 12:50 AM
Thailand's appetite for more electricity has led to the construction of new dams along the Mekong River to the north and new coal plants near the country's famous beaches in the south. A proposed coal plant in a so-called "green zone" has touched off a debate. VOA's Steve Sandford reports.
Video

Video Are Energy Needs Putting Thailand's Natural Beauty at Risk?

Thailand's appetite for more electricity has led to the construction of new dams along the Mekong River to the north and new coal plants near the country's famous beaches in the south. A proposed coal plant in a so-called "green zone" has touched off a debate. VOA's Steve Sandford reports.
Video

Video Overwhelmed by Migrants, Italy Mulls Military Action to Stabilize Libya

Thousands more migrants have arrived on the southern shores of Italy from North Africa in the past two days. Authorities say they expect the total number of arrivals this year to far exceed previous levels, and the government has said military action in Libya might be necessary to stem the flow. VOA's Henry Ridgwell reports.
Video

Video Putin Accuses Kyiv of ‘Cutting Off’ Eastern Ukraine

Russian President Vladimir Putin, in his annual televised call-in program, again denied there were any Russian troops fighting in Ukraine. He also said the West was trying to ‘contain’ Russia with sanctions. Henry Ridgwell reports on reactions to the president’s four-hour TV appearance.
Video

Video Eye Contact Secures Dog's Place in Human Heart

Dogs serve in the military, work with police and assist the disabled, and have been by our side for thousands of years serving as companions and loyal friends. We love them. They love us in return. VOA’s Rosanne Skirble reports on a new study that looks at the bio-chemical bond that cements that human-canine connection.
Video

Video Ukrainian Volunteers Search for Bodies of Missing Soldiers

As the cease-fire becomes more fragile in eastern Ukraine, a team of volunteer body collectors travels to the small village of Savur Mohyla in the what pro-Russian separatists call the Donetsk Peoples Republic - to retrieve bodies of fallen Ukrainian servicemen from rebel-held territories. Adam Bailes traveled with the team and has this report.
Video

Video Xenophobic Violence Sweeps South Africa

South Africa, long a haven for African immigrants, has been experiencing the worst xenophobic violence in years, with at least five people killed and hundreds displaced in recent weeks. From Johannesburg, VOA’s Anita Powell brings us this report.
Video

Video Sierra Leone President Koroma Bemoans Ebola Impact on Economy

In an interview with VOA's Shaka Ssali on Wednesday, President Ernest Koroma said the outbreak undermined his government’s efforts to boost and restructure the economy after years of civil war.
Video

Video Protester Lands Gyrocopter on Capitol Lawn

A 61-year-old mailman from Florida landed a small aircraft on the Capitol lawn in Washington to bring attention to campaign finance reform and what he says is government corruption. Wednesday's incident was one in a string of security breaches on U.S. government property. Zlatica Hoke reports the gyrocopter landing violated a no-fly zone.
Video

Video Apollo 13, NASA's 'Successful Failure,' Remembered

The Apollo 13 mission in 1970 was supposed to be NASA's third manned trip to the moon, but it became much more. On the flight's 45th anniversary, astronauts and flight directors gathered at Chicago's Adler Planetarium to talk about how the aborted mission changed manned spaceflight and continues to influence space exploration today. VOA’s Kane Farabaugh reports.
Video

Video Badly Burned Ukrainian Boy Bravely Fights Back

A 9-year-old Ukrainian boy has returned to his native country after intensive treatment in the United States for life-threatening burns. Volodia Bubela, burned in a house fire almost a year ago, battled back at a Boston hospital, impressing doctors with his bravery. Faith Lapidus narrates this report from VOA's Tetiana Kharchenko.
Video

Video US Maternity Leave Benefits Much Less Than Many Countries

It was almost 20 years ago that representatives of 189 countries met at a UN conference in Beijing and adopted a plan of action to achieve gender equality around the world. Now, two decades later, the University of California Los Angeles World Policy Analysis Center has issued a report examining what the Beijing Platform for Action has achieved. From Los Angeles, Elizabeth Lee has more.
Video

Video Endangered Hawaiian Birds Get Second Chance

Of the world's nearly 9,900 bird species, 13 percent are threatened with extinction, according to BirdLife International. Among them are two Hawaiian honeycreepers - tiny birds that live in the forest canopy, and, as the name implies, survive on nectar from tropical flowers. Scientists at the San Diego Zoo report they have managed to hatch half a dozen of their chicks in captivity, raising hopes that the birds will flutter back from the brink of extinction. VOA’s George Putic reports.
Video

Video Exhibit Brings Renaissance Master Out of the Shadows

The National Gallery of Art in Washington has raised the curtain on one of the most intriguing painters of the High Renaissance. Mostly ignored after his death in the early 1500s, Italian master Piero di Cosimo is now claiming his place alongside the best-known artists of the period. VOA’s Ardita Dunellari reports.
Video

Video Sidemen to Famous Blues Artists Record Their Own CD

Legendary blues singer BB King was briefly hospitalized last week and the 87-year-old “King of the Blues” may not be touring much anymore. But some of the musicians who have played with him and other blues legends have now released their own CD in an attempt to pass the torch to younger fans... and put their own talents out front as well. VOA’s Greg Flakus has followed this project over the past year and filed this report from Houston.
Video

Video Iran-Saudi Rivalry Is Stoking Conflict in Yemen

Iran has proposed a peace plan to end the conflict in Yemen, but the idea has received little support from regional rivals like Saudi Arabia. They accuse Tehran of backing the Houthi rebels, who have forced Yemen’s president to flee to Riyadh, and have taken over swaths of Yemen. As Henry Ridgwell reports for VOA, analysts say the conflict is being fueled by the Sunni-Shia rivalry between the two regional powers.

VOA Blogs