ISLAMABAD: The first clinical trial to test the effectiveness of Ebola vaccines was expected to begin in Liberia in two weeks.
Volunteers in the trial will be given either a vaccine being developed byGlaxoSmithKline, a vaccine being developed by Merck or a placebo. There are expected to be 9,000 people in each arm of the trial, New York times reported.
The number of new Ebola cases is waning in West Africa. Officials from the United States Department of Health and Human Services said that could make it harder to determine if either of the vaccines was preventing disease.
More participants may have to be added to the trial, or it may need to be expanded to neighboring Sierra Leone, they said.
Even if there are not enough Ebola cases to determine efficacy, they said, data would be gathered on the safety of the vaccines and the immune responses they generate.
Combined with results from testing on animals, that could be enough for the vaccines to win regulatory approval from the United States. And if the vaccines are ready too late for this outbreak, they said, there are bound to be others in the future.
The officials also said a trial would start soon in Liberia to test ZMapp, a drug for patients already infected with the virus.
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