Ebola Vaccine Trials Begin; Ebola Vaccine Trial Cancelled

The Guardian reports that trials of two potential Ebola vaccines began in Liberia in early February and the following day, the trial of another potential Ebola vaccine was cancelled due to falling numbers of new Ebola cases. All three vaccines were developed and manufactured by different companies, but the ending of the trial of the drug brincidofovir (manufactured by Chimerix) raises questions about the viability of the other vaccine trial. There were only 4 new cases of Ebola in the last week of January; this may mean there are too few cases for an effective drug trial.