Ebola virus behind massive outbreak in DRC could be mutating, officials say

Cases have passed 4,000 and health watchdog plans to go door to door to find patients in major response escalation

The virus causing a massive outbreak of Ebola in the Democratic Republic of the Congo could be mutating, health officials fear, as confirmed cases pass 4,000.

Africa's public health watchdog said the time for incremental action was over as they announced plans to scale up every aspect of the response and go door to door" looking for patients.