As of Tuesday, 3442 cases had been recorded, with 1521 deaths, according to an update by the Democratic Republic of the Congo government on Thursday.
The outbreak, which was declared on May 15, has been linked to the Bundibugyo virus, for which there is no approved vaccines or treatments.
There are 797 patients in isolation or hospitalised, while a further 615 patients have recovered.
Contact tracing continues to lag, with only 78 per cent of known contacts monitored nationwide, well below the 95 per cent target health officials say is needed to interrupt transmission.
The outbreak is mostly concentrated in eastern Congo's remote Ituri province, which accounts for nearly 90 per cent of cases, but there have been others confirmed in five provinces including one of the country's largest cities, Kisangani.
Neighbouring Uganda declared itself free of Ebola on Tuesday following the discharge of the country's last patient in mid-June.
Ebola is rare, but highly contagious and can be contracted via bodily fluids such as vomit, blood or semen.
The disease it causes is severe and often fatal.
The latest outbreak has killed more people at a quicker rate than any previous outbreak, including in 2014 to 2016 when 28,000 cases were reported, of which more than 11,000 people died.
That outbreak took about eight months to reach 1000 deaths.
The speed of transmission in the current outbreak comes amid public concern that many communities in the affected provinces are either unreachable or have been abandoned by responders in recent days over safety concerns amid attacks from angry residents and rebels.
International partners supporting the Ebola response in Ituri's Nyakunde health zone temporarily withdrew after a July 15 attack on a hospital and a treatment center, sparked by a patient's death.
Officials say the withdrawal of aid groups including the World Health Organization, Africa CDC, Samaritan's Purse and Mercy Corps, has disrupted surveillance, contact tracing and supplies.
Local health officials say security has since stabilised and are urging partners to return, with Africa CDC saying teams could redeploy as soon as next week.
