The threshold of 500 deaths crossed in six months of Ebola outbreak in eastern Democratic Republic of Congo.
In the last six months, at least 785 people have been affected, including 502.
A fifth of them are children, most of whom were under five, according to Save the Children.
In January, cases went from 20 per week to 40.
"If urgent action is not taken, the epidemic could last another six months, if not all year," said Heather Kerr, country director of the NGO in the DRC.
Some of the affected communities are hostile to health workers.
Insecurity and violence in the east of the country, coupled with fear and suspicion in some communities, make it difficult to control the epidemic, the second most devastating in history.
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