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The Independent UK
The Independent UK
Health
Alexander Butler

What is sloth fever? Symptoms and advice after UK Oropouche virus cases

There people were confirmed to have the Oropuche virus in the UK after coming home from Brazil. It is also known as ‘sloth fever’ - (Alamy/PA)

The UK’s health security watchdog has issued an urgent warning as cases of a deadly malaria-like “sloth virus” were found in Britain for the first time.

Three cases of Oropouche virus, which naturally occurs in sloths, primates and birds, were reported across Britain between January and June 2025, according to the UK Health Security Agency (UKHSA.

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