A virologist says the vaccine is an essential first step and justifies some optimism . All the volunteers in the first clinical trial of the vaccine produced anti - Ebola antibodies . None of the volunteers suffered serious side effects , the National Institutes of Health says . The vaccine carries genetic material from the virus , but there 's no evidence of viral infection .
A virologist says the trial is an essential first step and justifies some optimism . All 20 volunteers in the first clinical trial of the vaccine produced anti-Ebola antibodies . None of the volunteers suffered serious side effects , the National Institutes of Health says . The vaccine carries genetic material from the virus , but there 's no risk of Ebola infection .