The World Health Organization assumes 100-300 cases of Ebola in Congo between May and July, under a revised response plan to the outbreak that it published on Tuesday.
An earlier version of the plan, based on information to May 15, had assumed 80-100 cases.
The WHO says the new figure is not a prediction but part of its modelling to plan and budget for a response.
Congo's Health Ministry said late on Monday there had been 54 cases of Ebola in the outbreak — 35 confirmed, 13 probable and six suspected — and 25 deaths. There have been no deaths or new confirmed cases in the past two days.
The deadly virus spreads easily through bodily fluids and eight previous outbreaks in Congo have claimed between 1 and 256 lives. A West African outbreak that began in late 2013 killed 11,300 before being brought under control in 2016.
WHO's plan for Congo assumes each rural Ebola case would have 10 potentially infected contacts and each urban case would have 30. As of May 26, there were 906 contacts being followed, WHO spokesman Tarik Jasarevic said.
No explosive increase in cases
Identifying contacts is crucial for stopping the spread of the disease. Health workers hope to vaccinate every contact to effectively ringfence each Ebola patient and prevent further spread.
WHO is cautiously optimistic about the progress of the Ebola response in Congo after 90 per cent of people at risk in the city of Mbandaka were vaccinated, a senior WHO official said on Tuesday.
"I think we can't conclude that we have safeguarded the city of Mbandaka but we can say that so far there has not been an explosive increase in cases, so that's a positive sign and a positive development," Peter Salama, WHO Deputy Director-General for Emergency Preparedness and Response, told reporters.
More than 400 potential Ebola contacts had been vaccinated.
Salama also said he hoped to get government approval within days to use five experimental drugs to treat Ebola patients, in a clinical trial which could lay the groundwork for more rapid treatments in future outbreaks.
The WHO estimates 1,000 people move each day through major points of entry connected to Bikoro health zone, the remote area of Equateur province where the outbreak was first declared. Around 50 per day go by boat from Bikoro to neighbouring Republic of Congo.
Since the plan was written, the disease has spread to the provincial capital Mbandaka, with an estimated population of 1.5 million people, and WHO has more than doubled its response budget, to $ 56 million US from an initial $ 26 million.
The plan also sets out targets for the disease response, including that 100 per cent of new cases should come from known contacts and none of the cases should be health care workers.
Zero contacts should be lost, and all people who die from suspected or probable Ebola should be buried in a safe way, to prevent the infection spreading.
The case fatality ratio for all confirmed cases admitted into Ebola treatment centres should be less than 50 per cent, it said.
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