An outbreak of Ebola in the Democratic Republic of the Congo (DRC) has almost certainly been spreading undetected for weeks or even months, say infectious-disease researchers. The World Health Organization (WHO) declared the outbreak a public health emergency of international concern on 17 May. At least 10 people have tested positive for Ebola virus, but more than 330 people have suspected infections, according to the US Centers for Disease Control and Prevention. So far, more than 80 people are thought to have died from the disease. Infections have also been reported in neighbouring Uganda, after two people with confirmed infections entered the country from the DRC. Both countries declared outbreaks last week, according to a statement from the Africa Centres for Disease Control and Prevention in Addis Ababa. Tedros Adhanom Ghebreyesus, director-general of the WHO, said infections have been reported among people with no connection to each other. At least four health-care workers in...
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