2-year - old girl dies . Forty - three countries are being monitored . Standards will have to be met for any mass vaccination program , WHO says . WHO also says that more potential Ebola vaccines are to start clinical trials soon .
2-year-old girl dies . Forty-three others are being monitored . Conditions would have to be met for any mass vaccination program , WHO says . WHO official says five more potential Ebola vaccines are to start clinical trials soon .