Graphs show why the DR Congo Ebola outbreak could be the worst in history
WHO director-general Tedros Adhanom Ghebreyesus says many of the deaths occurring in the Democratic Republic of Congo are happening outside of known transmission chains, meaning the outbreak is a long way from being brought under control.

Health officials are warning that the ongoing Ebola outbreak in the Democratic Republic of Congo is on track to become one of the deadliest in history. World Health Organization director-general Tedros Adhanom Ghebreyesus said a large share of deaths are occurring outside known chains of transmission, indicating the virus is spreading quietly within communities.
Health workers are struggling to trace cases in remote and hard-to-reach areas, complicating efforts to monitor the disease's spread. Weak health infrastructure and security restrictions are delaying vaccination and treatment teams from reaching affected regions.
International health organisations are calling for additional funding and logistical support. Experts say the inability to trace transmission chains raises the risk of the outbreak spreading across borders and turning into a broader regional public health emergency.
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