New Delhi, June 16 -- Congolese authorities have reported one of the highest daily increases in Ebola cases in a month-old outbreak as the virus spreads quickly in a remote region whose shifting population challenges efforts to find those exposed.

Congo's Ministry of Health on Sunday said 72 new cases were reported in a 24-hour period, bringing the total number of confirmed cases to 782. Those include 181 confirmed deaths, with 29 new ones.

"One month on, the Ebola disease outbreak is outpacing the response effort," Kate White, emergency medical coordinator for Doctors Without Borders in Congo, said Monday. "No one knows the true scale or exactly where the disease is spreading in Congo."

The medical charity said treatment centers in th...