Congo has made great strides in fighting Ebola, but the virus is not yet under control, a senior World Health Organisation (WHO) official said on Friday, a month after an outbreak was declared in the country.
The outbreak stands at 62 cases, including 27 deaths, with the most recent confirmed case identified on Jun 2 in a known contact from Iboko health zone.
WHO has vaccinated more than 1,000 people over the past two weeks in all areas of the outbreak, including health workers who are at high risk.
The WHO, however, has noted that the Ebola outbreak does not now meet the conditions for a public health emergency of global concern, and that there should be no worldwide travel or trade restrictions.
World Health Organization said four of the five approved drugs are now in the country, which are Zmapp, GS-5734, REGN monoclonal antibody combination, and mAb114, under the framework of compassionate use and expanded access.
He said that the first phase - protecting urban centres and towns - "has gone well, and we can be cautiously optimistic".
"There's been very strong progress in the outbreak response, particularly in relation to two of three sites", Salama said.
Mbandaka, in northwest DRC, has a population of around one million.
It is the capital of Equateur province, where the small town of Bikoro also is located. "And then if there is a confirmation of a case, every contact of those cases", he explained.
"We have added cause for optimism because now we have reached... more than 98 percent of the contacts with vaccination", Salama said.
He warned, however, that experts are not in a position to document all chains of transmission of the virus, so "there may still yet be unknown chains out there and there may still be surprises in this outbreak".
The area had no infrastructure and could be covered only by motorbike, with several hours needed to trace every contact, he said.
On Monday, the Ministry of Health approved the use of these experimental treatments, some used on patients in past outbreaks, during the current outbreak.
The other was reported from the area of Iboko, but the family were refusing to allow doctors to take a blood sample to test for Ebola, it said.
"We're cautiously optimistic but there's a lot of work", said Salama.