News / Health

Ebola Emergency Turns Spotlight on Experimental Drugs

Tekmira Pharmaceuticals Corporation's head office is pictured in Burnaby, British Columbia Aug. 5, 2014.
Tekmira Pharmaceuticals Corporation's head office is pictured in Burnaby, British Columbia Aug. 5, 2014.
Reuters

With hundreds of patients in Africa suffering the devastating effects of Ebola, health experts are scrambling to determine which drugs might offer the best experimental treatment, and researchers are being pressed by government officials to speed up their work.

Three treatments have shown especially promising results in monkeys, the researchers said. One, produced by tiny California biotech Mapp Biopharmaceutical, gained international prominence this week when it was given to two U.S. aid workers who contracted Ebola in West Africa and have since shown signs of improvement.

Others are from Vancouver-based Tekmira Pharmaceuticals and privately-held Profectus BioSciences, of Tarrytown, NY.

Click to enlargeClick to enlarge
x
Click to enlarge
Click to enlarge

On Wednesday the World Health Organization said it would discuss next week the ethics of using Ebola drugs that have never been cleared for human use, wary of a long history of medicines being tested on people who were never properly informed of the risks. In the countries hardest hit by Ebola, suspicion of foreign medical workers is already widespread.

But the health minister of Nigeria, Onyenbuchi Chukwu, told reporters this week that he had asked U.S. health officials about access to experimental Ebola therapies. U.S. drugmakers are fielding questions from government officials about their ability to supply treatments in sufficient quantities should the request come.

"For years we've told the government you need to invest a little bit of money in this," said Profectus chief scientific officer John Eldridge. "And now it's, 'Oh my God, how fast can you make this?' "

Officials at Mapp and Tekmira would not comment on efforts to make their treatments available in response to the outbreak.

President Barack Obama speaks at a news conference at the conclusion of the U.S.-Africa Leaders Summit at the State Department in Washington, August 6, 2014.President Barack Obama speaks at a news conference at the conclusion of the U.S.-Africa Leaders Summit at the State Department in Washington, August 6, 2014.
x
President Barack Obama speaks at a news conference at the conclusion of the U.S.-Africa Leaders Summit at the State Department in Washington, August 6, 2014.
President Barack Obama speaks at a news conference at the conclusion of the U.S.-Africa Leaders Summit at the State Department in Washington, August 6, 2014.

Speaking at a news conference on Wednesday, President Barack Obama said he lacks enough information to green-light Mapp's drug to treat the deadly Ebola virus and that the initial response should focus on public health measures to contain the outbreak.

"We've got to let the science guide us, and I don't think all the information is in on whether this drug is helpful," the president said, adding that public health officials, in the course of containing the current outbreak, could assess whether new drugs or treatments can be effective.

"We're focusing on the public health approach right now, but I will continue to seek information about what we're learning about these drugs going forward," he said.

Dr. James Crowe, director of the Vaccine Center at Vanderbilt University who has been developing an Ebola treatment similar to Mapp's, said a Pentagon agency contacted him this week about his work and added he will meet next week with government scientists about accelerating his research.

Monkey tests

No Ebola drugs or vaccines have even entered mid-stage human trials, let alone been approved. The furthest along have been tested only in monkeys and a handful of humans.

Mapp Biopharmaceutical began developing its ZMapp treatment more than a decade ago. It consists of a cocktail of nonoclonal antibodies, proteins that are highly specific for the Ebola virus and that are produced in bioengineered tobacco plants.

In 2012 Mapp, working with scientists at the U.S. Army Military Research Institute of Infectious Diseases (USAMRIID) in Fort Detrick, Maryland, announced that when rhesus macaques received the cocktail an hour after infection by Ebola, all survived. When they received it 48 hours after infection, two-thirds survived.

Last year, ZMapp passed a stiffer test: monkeys that had been infected with Ebola and developed fevers and other symptoms received the intravenous cocktail 104 to 120 hours after infection; 43 percent recovered.

When the U.S. government decided to develop a contingency plan in case of accidental exposure to Ebola by one or two people at a U.S. research facility, it began storing a small amount of ZMapp, according to a source familiar with the contingency plan. ZMapp was chosen because the science is relatively easy to understand and the risks considered relatively small, the source said.

The stock of Tekmira soared on expectations its Ebola drug might speed toward approval due to the crisis, or even be used in the current outbreak.

Under a $140 million contract with the U.S. Department of Defense, it is developing a drug based on a genetic technology called RNA interference.

The idea is to take strands of genetic material that are the virus's mirror image and, using nanoparticles, slip them into cells where Ebola is replicating. In theory, the RNA disables the virus.

In experiments by scientists at the army research unit, Tekmira reported last November, most animals infected with lethal amounts of Ebola survived when given the RNA product. The survival rate was 83 percent when the animals were treated 24 or 48 hours after infection and 67 percent when they were treated 72 hours after.

"It is amazing how well that works in non-human primates," said Ebola researcher Thomas Geisbert of the University of Texas Medical Branch, who has conducted several studies of the company's drug in monkeys.

Human trials

Last month, Tekmira announced that its early-stage human trial had been put on hold by the U.S. Food and Drug Administration, which had concerns about the drug's safety.

Tekmira declined requests for an interview.

Profectus BioSciences has also tested its Ebola vaccine in monkeys, with good results, said Eldridge.

In a study with scientists at government biomedical research centers and the Pentagon, Profectus found that a single intramuscular injection protected all of the rhesus monkeys exposed to Ebola three weeks later. The company hopes to launch a human trial to assess the vaccine's safety within the next 12 months, Eldridge said.

An experimental vaccine similar to Profectus's, developed by academic and government scientists, was rushed into emergency use only once. In 2009 a scientist in Germany working with Ebola-infected guinea pigs pricked her finger with a syringe containing the virus. The vaccine was flown from Canada, one of the sites where it was being developed.

"She got that vaccine in less than 40 hours and survived," said Geisbert, though it's impossible to know whether that was because of the vaccine. "She lived. That's all I care about."

With greater financial support, scientists said, Ebola treatments could be ready for use sooner. For less than $10 million, said Vanderbilt's Crowe, four or five of the experimental drugs could be ready for testing within in four months.

All of them seem to be effective only in a small window after exposure, however.

"Nothing on planet Earth is going to work if somebody comes in with full-blown Ebola hemorrhagic fever and they are 24 hours or 72 hours from death," said Geisbert. "The damage has been done."

You May Like

Obama: I Will Do 'Everything I Can' to Close Guantanamo

US president says prison continues 'to inspire jihadists and extremists around the world' More

Sierra Leone Educates on Safe Ebola Burials

Also, country is improving at rapid response to isolated outbreaks, but health workers need to be even faster, officials say More

Christmas Gains Popularity in Vietnam

Increasingly wealthy Vietnamese embrace holiday due to its non-religious glamor, commercial appeal More

This forum has been closed.
Comment Sorting
Comments
     
by: John
August 11, 2014 11:00 AM
The US is still involved in the war in Somalia, decades after Bush Snr foolishly sent troops to help distribute food to the starving. The revolt by Boko Haram against polio vaccination goes from strength to strength. (Don't know whether the suit against the drug company that tested an experimental drug on the people of Kano has been settled though.) Yet some people still think we should give experimental drugs to Africans. They'll never learn!! The fact is, if Africans were really concerned about this disease, they'd have made a deal with Western drug companies to do the clinical trials of potential vaccines and cures decades ago. This doesn't take super technical skill; merely careful record keeping and a plentiful supply of victims---oops brave volunteers, to try the drugs. They just decided to wait until we panicked, so we'd provide all the money and guinea pigs ourselves. Must admit their strategy is working like a charm!!!

Featured Videos

Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
US Decision on Cuba Underscores Divisions Among Miami Cubansi
X
Sharon Behn
December 19, 2014 9:34 PM
For decades, older, more conservative Cubans have been gathering at Café Versailles on the corner of Calle Ocho to eat Cuban food and talk politics. After hearing of President Barack Obama’s decision, a number of them gathered in front of the café with posters to protest. VOA's Sharon Behn reports on the situation.
Video

Video US Decision on Cuba Underscores Divisions Among Miami Cubans

For decades, older, more conservative Cubans have been gathering at Café Versailles on the corner of Calle Ocho to eat Cuban food and talk politics. After hearing of President Barack Obama’s decision, a number of them gathered in front of the café with posters to protest. VOA's Sharon Behn reports on the situation.
Video

Video Three Cities Bid for Future Obama Presidential Library

President Barack Obama still has two years left in his term in office, but the effort to establish his post-presidential library is already underway. The bid for the Obama Presidential Library is down to four locations in three states -- New York, Hawaii, and Illinois. As VOA’s Kane Farabaugh reports, each of them played an important part in the president’s life before he reached the White House.
Video

Video Cuba Deal is Major Victory for Pope’s Diplomatic Initiatives

Pope Francis played a key role in brokering the US-Cuba deal that was made public earlier this week. It is the most stunning success so far in a series of peacemaking efforts by the pontiff. VOA religion reporter Jerome Socolovsky has more.
Video

Video Fears of More Political Gridlock in 2015

2014 proved to be a difficult year politically for President Barack Obama and a very good year for the U.S. Republican Party. Republican gains in the November midterm elections gave them control of the Senate and House of Representatives for the next two years -- setting the stage for more confrontation and gridlock in the final two years of the Obama presidency. VOA National Correspondent Jim Malone has a preview from Washington.
Video

Video Sudan School Becomes Target of Aerial Attacks

The school dropout rate is at an all-time high in Sudan's South Kordofan state because many schools have been destroyed during the three-year civil war between the government and SPLA-N rebel forces. Adam Bailes visited Sudan's Nuba Mountains' region and reports many children are simply too scared to go to school
Video

Video VOA Reporter Tours Devastated Peshawar School

Islamist militants wearing military uniforms and strapped with explosives attacked a military run school Tuesday in the northwestern Pakistani city of Peshawar. At least 141 people were killed in the horrific attack, most of them young students. VOA reporter Ayaz Gul visited the devastated school and attended the funeral of the principal who courageously tried to save her students from the deadly attack.
Video

Video Nigerians Fleeing Boko Haram Languish in Camp Near Capital

In its five-year effort to impose Islamic law in northeastern Nigeria, the Boko Haram extremist group has killed thousands of people and forced hundreds of thousands to flee. Some of those who ran for their lives now live in squalor on the edges of the capital, Abuja. Chris Stein reports for VOA.
Video

Video Aceh Rebuilt Decade After Tsunami, But Scars Remain

On December 26, 2004 there was an earthquake in the Indian Ocean so powerful it caused the Earth’s axis to wobble a few centimeters. Onshore on the island of Sumatra, the resulting tsunami was devastating. A decade later, VOA Correspondent Steve Herman reports from Banda Aceh, Indonesia, where although there is little remaining evidence of the physical devastation, the psychological scars among survivors remain.

All About America

AppleAndroid