The clinical trial of a promising Ebola vaccine has been suspended in Geneva after some patients complained of joint pain.
Some 60 people had been injected with the vaccine and four of them complained of problems with their feet and hands.
One of the directors of the trial, Professor Laurent Kaiser, said only one site involved in the study has experienced problems.
“So far the side effects have only been detected in Geneva,” he said. “Maybe because here the volunteers are closely monitored. We have lots of medical personnel and volunteer doctors. The symptoms have only been weak and didn’t last long. Maybe here they have been detected a little more accurately.”
Researchers in numerous locations are attempting to develop vaccines for Ebola, which has so far killed more than 6,000 people in West Africa.
Authorities say the trial in Geneva will resume early next year once checks have been made on the affected patients.