Scientists discover a new virus lurking in bats

Scientists discover a new virus lurking in bats: Similar pathogens kill up to one in three humans

  • The Kiwira virus was found in bats in African countries Tanzania and the DRC
  • It is not known if the virus – a type of hantavirus –  poses a threat to humans
  • If transferred to humans, Sin Nombre virus – a hantavirus –  can kill one in three
  • It comes after it was revealed Britain’s pandemic-fighting lab was left to crumble 

Scientists have discovered a new virus lurking in bats.

The Kiwira virus — a type of hantavirus — has been found in free-tailed bats in Tanzania and the Democratic Republic of the Congo.

There is currently no evidence to show the virus could pose a threat to humans but researchers are conducting follow-up studies.

Hantaviruses are usually found in rodents and spread to humans through virus-containing particles, with one variant killing more than a third of those it infects.

The group of viruses can trigger mild flu-like illness symptoms but also excessive bleeding and kidney failure.

It comes after MPs warned last week that Britain’s biggest animal disease facility — responsible for monitoring animal-borne infections — has been left to crumble. 

The Kiwira virus – a type of hantavirus – has been found in free-tailed bats in Tanzania and the Democratic Republic of the Congo

Research is to be carried out among bats in the area to better understand their make up and how possible it is for these viruses to spread to humans. 

Detailing the new virus in the journal Viruses, the researchers, led by Dr Sabrina Weiss, head of public health at the Centre for International Health Protection in Berlin, noted that free-tailed bats cover ‘large regions’ of Sub-Saharan Africa.

And the species is known to roost ‘inside and around human dwellings’, so a ‘potential spillover of the Kiwira virus to humans must be considered’, they warned.

How the disease can affect humans depends on what type of hantavirus it is.    

Sin Nombre virus — a hantavirus spread by deer mice in the USA — can kill up to one in three humans, whereas Puumala virus — commonly associated with bank moles — has a mortality rate of less than one in 200.

There is currently not much evidence to suggest the Kiwira virus poses a significant problem to bats either, with just six out of 334 bats from Tanzania and one out of 49 bats from DRC found to be carrying the disease. 

However researchers said: ‘Hantavirus disease often manifests as a febrile illness with non-specific symptoms […] and might be easily overlooked.’

The viruses are spread to humans through contact with an infected animal’s urine, faeces and saliva. 

Chelsea Wood, an assistant professor of parasite ecology at the University of Washington, spoke of the risks in National Geographic. 

She said: ‘The scary thing about these zoonotic viruses is that the spillover process is happening all the time. Covid is a great example.’

It comes after it was revealed that the Animal and Plant Health Agency’s (APHA) headquarters — the site tasked with stopping animal-borne infections in their tracks — was found to have been ‘left to deteriorate to an alarming extent’.

Parliament’s Public Accounts Committee warned the APHA site, near Weybridge, Surrey, would cost up to £3billion to fix it over the next 15 years.

That is despite the Covid pandemic showing how easily an animal-sourced virus can plunge the world into chaos. 

APHA’s Weybridge site is the UK’s primary science facility for managing threats from animal diseases. 

Dame Meg Hillier MP, chairwoman of the Public Accounts Committee, said: ‘These diseases are devastating for our food production systems, the economy and, when they jump the species barrier to humans as Covid did, to our whole society.’ 

APHA’s Weybridge site is the UK’s primary science facility for managing threats from animal disease but the Environment Department (Defra) has ‘comprehensively failed in its historical management’ of the complex

In June, the World Health Organisation (WHO) released a report on Covid, saying bats most likely transferred the virus to humans. 

The new report, called Scientific Advisory Group for the Origins of Novel Pathogens (SAGO), said a zoonotic origin was the most likely explanation for the emergence of the novel coronavirus. 

The first human cases were reported in December 2019 in the central Chinese city of Wuhan.

However, the report said that neither the original animal source, the intermediate host, nor the moment the virus crossed over into humans, has been identified.

That is chiefly because a lot of data is missing, the report said, particularly from China. 


Zoonotic diseases are able to pass from one species to another.

The infecting agent – called a pathogen – in these diseases is able to cross the species border and still survive. 

They range in potency, and are often less dangerous in one species than they are in another. 

In order to be successful they rely on long and direct contact with different animals.  

Common examples are the strains of influenza that have adapted to survive in humans from various different host animals. 

H5N1, H7N9 and H5N6 are all strains of avian influenza which originated in birds and infected humans.

These cases are rare but outbreaks do occur when a person has prolonged, direct exposure with infected animals. 

The flu strain is also incapable of passing from human to human once a person is infected.  

A 2009 outbreak of swine flu – H1N1 – was considered a pandemic and governments spent millions developing ‘tamiflu’ to stop the spread of the disease. 

Influenza is zoonotic because, as a virus, it can rapidly evolve and change its shape and structure.  

There are examples of other zoonotic diseases, such as chlamydia. 

Chlamydia is a bacteria that has many different strains in the general family. 

This has been known to happen with some specific strains, Chlamydia abortus for example.

This specific bacteria can cause abortion in small ruminants, and if transmitted to a human can result in abortions, premature births and life-threatening illnesses in pregnant women.

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