A mysterious new virus of completely unknown origin has emerged from a lake in Brazil leaving scientists puzzled. It has been named Yaravirus after Yara, a supernatural mermaid who lured soldiers underwater to live with her.

A mysterious new virus of completely unknown origin has emerged from a lake in Brazil leaving scientists puzzled.

It has been named Yaravirus after Yara, a supernatural mermaid who lured soldiers underwater to live with her.

Researchers found over 90 per cent of Yaravirus genes have never been seen before, making it ‘mysterious’ and wholly unique.

The discovery comes amid the outbreak of a killer novel virus across the world which started in China.

COVID-19 coronavirus was first discovered in December 2019, and since, has killed more than 1,000 people and infected over 44,500.

Yaravirus was documented by scientists in January after they unexpectedly came across it at Lake Pampulha, an artificial lake in the Brazilian city of Belo Horizonte.

They sequenced the virus genome to look at its DNA, finding 74 genes in total. Only six of those had been recorded in literature before.

The other 68 have never been seen before, known as orphan genes.

A search of over 8,500 genetic material from across the globe in a scientific database offered no clues as to what Yaravirus might be closely related to.

The team, led by Brazil’s Federal University of Minas Gerais, said: ‘Yaravirus expands our knowledge of the diversity of DNA viruses.’

Yaravirus was taken from a single-celled creature called amoeba, which live in damp environments.

The scientists speculate Yaravirus is the first isolated case of an unknown group of an amoebal virus.

They write Yaravirus has ‘a new lineage of an amoebal virus with a puzzling origin and phylogeny’ in a published paper on the server bioRxiv.

‘Most of the known viruses of amoeba have been seen to share many features that eventually prompted authors to classify them into common evolutionary groups,’ the authors write.


For now, Yaravirus doesn’t appear to pose any threat to humans. For a start, it cannot transfer to humans – only between amoeba.

It’s not unheard of for scientists to find distinct viruses, and in the years between 2016 and 2019, new discoveries in the world’s oceans surged from 15,222 to 195,728, Quanta reports.

Two of the senior members of the team that report Yaravirus – virologists Bernard La Scola from Aix-Marseille University in France, and Jônatas S. Abrahão from Brazil’s Federal University of Minas Gerais – are no strangers to unique viruses.

Two years ago, the pair helped to discover another water-dwelling viral novelty. Tupanvirus, also named after a mythological god, was found in a lake in Brazil.

Tupanvirus is a giant virus, so-called because they are protected by huge protein shells.

But Yaravirus is a much smaller specimen, and less complex. Importantly, the scientists said, it novel.

They said: ‘Contrary to what is observed in other isolated viruses of amoeba, Yaravirus is not represented by a large/giant particle and a complex genome, but at the same time carries an important number of previously undescribed genes.’

Another novel virus, discovered in December 2019, is currently spreading among the human population at a rapid speed.

COVID-19 coronavirus jumped from animals in a food market in China to humans and has since developed the ability to spread between people via a cough or sneeze.

So far what’s been described as ‘the worst enemy you can ever imagine’ has claimed more than 1,000 lives and struck down over 44,500 people in a matter of weeks.

It is feared the coronavirus has the potential to infect more than 60 per cent of the population if containment methods fail, based on a top Hong Kong medical officials predictions.

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