India, June 10 -- At least 100 people have died from Ebola less than a month after authorities declared an outbreak of the disease in eastern Congo, authorities said.

Attacks on health workers from angry residents, scepticism among some locals and armed conflict in hot spots continue to challenge efforts to stop the outbreak declared on May 15.

Out of the 550 cases of the disease confirmed as of Sunday, there have been 101 deaths and 19 recoveries, according to the latest situation report late Monday.

The outbreak is concentrated in Congo's eastern province of Ituri, which accounts for more than 90 per cent of the cases. Cases have also been recorded in the North Kivu and South Kivu provinces, and have spread across the border to Ugand...