Washington: A single monoclonal antibody isolated from a human survivor of Ebola virus disease (EVD) completely protects monkeys from the lethal virus, and could hold promise as a potential treatment for infected humans, according to new research.
The antibody, known as mAb114, was effective even when given five days after exposure to Ebola virus, researchers said.
Although several clinical trials are in progress, there are currently no licensed therapies against Ebola virus. Antibodies, or proteins produced by the immune system in response to infection, represent one possible approach to treating the disease.
Researchers from the US Army Medical Research Institute of Infectious Diseases (USAMRIID) administered a lethal dose of Zaire ebola virus to rhesus macaques.
After five days, the team treated three of the animals with daily intravenous injections of mAb114 for three consecutive days.
All the treated animals survived and were free of EVD symptoms, while the untreated animal developed clinical signs of the disease.
The antibody was developed by scientists at the US National Institute of Allergy and Infectious Diseases, who discovered Ebola virus antibodies in blood samples from a survivor of the 1995 Ebola virus outbreak in Democratic Republic of the Congo.
Researchers from the Institute for Research in Biomedicine in Switzerland isolated the specific antibodies to test for potential efficacy in treating Ebola virus infection. According to John C Trefry, of USAMRIID, a principal investigator, the study is the first to successfully evaluate a single antibody for efficacy against Ebola virus.
"While several antibody 'cocktails' have been tested, this is the first time we've evaluated a single antibody and demonstrated protection in nonhuman primates," Mr Trefry said, adding that having a single antibody could greatly simplify the development and regulatory approval process.
Ebola virus causes severe hemorrhagic fever in humans and nonhuman primates with high mortality rates and continues to emerge in new geographic locations, including West Africa, the site of the largest outbreak to date.
Since 2014, over 28,500 cases have been reported in Guinea, Liberia and Sierra Leone, with over 11,000 deaths, according to the World Health Organisation.
The study was published in the journal Science.
The antibody, known as mAb114, was effective even when given five days after exposure to Ebola virus, researchers said.
Although several clinical trials are in progress, there are currently no licensed therapies against Ebola virus. Antibodies, or proteins produced by the immune system in response to infection, represent one possible approach to treating the disease.
After five days, the team treated three of the animals with daily intravenous injections of mAb114 for three consecutive days.
Advertisement
The antibody was developed by scientists at the US National Institute of Allergy and Infectious Diseases, who discovered Ebola virus antibodies in blood samples from a survivor of the 1995 Ebola virus outbreak in Democratic Republic of the Congo.
Advertisement
"While several antibody 'cocktails' have been tested, this is the first time we've evaluated a single antibody and demonstrated protection in nonhuman primates," Mr Trefry said, adding that having a single antibody could greatly simplify the development and regulatory approval process.
Advertisement
Since 2014, over 28,500 cases have been reported in Guinea, Liberia and Sierra Leone, with over 11,000 deaths, according to the World Health Organisation.
Advertisement
COMMENTS
Advertisement
2 Experimental Drugs "Very Good News" For Ebola Treatment: Scientists Experts Warn Complacency On Ebola May Leave Vaccine Work Unfinished Scientists Create Antibody Cocktail That Cures Ebola-Infected Monkeys: Study Trump, Musk Groove To Bee Gees' 'Stayin' Alive' In AI-Video Now Viral 150 mg Semen In Kolkata Doctor's Body, Suspect Gang-Rape: Parents To Court "Want To Ask Congress...": Mamata Banerjee Snaps At Ally In Rape-Murder Case US Judge Says "Monopolist" Google Can't Avoid App Store Reforms NASA To Decide Stranded Starliner Astronauts' Route Home By End Of Month Mob Vandalises Hospital During Protest Over Kolkata Horror Track Latest News Live on NDTV.com and get news updates from India and around the world.