"Confirmed cases by today 131 and 48 deaths," Henry Kyobe Bosa, Ebola incident commander at Uganda's health ministry, told a briefing organized by the World Health Organization's Africa office.
Last week, Uganda's health minister put the death toll at 30, with 109 confirmed cases.
"On the spread and when we are likely to have the outbreak ending I see no experts on this panel can actually predict when it will end," Bosa said, adding authorities were using measures like contact-tracing, risk communication, and appropriate treatment and burials to control the outbreak.
The virus circulating in Uganda is the Sudan strain of Ebola, for which there is no proven vaccine, unlike the more common Zaire strain seen during recent outbreaks in Democratic Republic of Congo.
WHO chief Tedros Adhanom Ghebreyesus said in mid-October that a clinical trial of vaccines to combat the Sudan strain of Ebola could start within weeks.
Africa's top public health body said last week it thought the situation was "not getting out of hand."
Last month, the Ugandan government said it was optimistic the Ebola outbreak could be wiped out by the end of the year.