Find out why Tedros Adhanom Ghebreyesus is on the TIME100 Health 2025 list.

Tanzania ’s president has confirmed an outbreak of the deadly Marburg virus disease (MVD), a highly infectious virus like Ebola that can be fatal in up to 88 per cent of cases without treatment.

The source of the outbreak is not yet known. “We would expect further cases in coming days as disease surveillance improves,” WHO chief Tedros Adhanom Ghebreyesus said in a social media post.

"We would expect further cases in the coming days as disease surveillance improves," WHO chief Tedros Adhanom Ghebreyesus said on X.

WHO Director-General Tedros Adhanom Ghebreyesus he expects more cases of the virus will increase "in the coming days" if Tanzania did not improve surveillance and contact tracing.

President Samia Suluhu Hassan confirmed a positive case in the northwestern Kagera region during a press conference alongside Dr Tedros Adhanom Ghebreyesus, the World Health Organisation (WHO ...