The countries most likely to be responsible an outbreak of a contagious killer virus such as Zika or dengue have been revealed by scientists.
Researchers have created heat maps to show viral hot-spots around the world, by working out which animals are most likely to spread illnesses and where.
The maps show where existing flaviviruses – infectious viruses spread mostly by mosquitoes and ticks – or similar new ones are most likely to surface and spread in the future.
For example, Japanese encephalitis is most likely to break out in Western Europe, while the West Nile Virus is a major threat in North America.
Information about thousands of bird and mammal species was involved in the study and researchers say it will help predict and track viruses around the world.
Scientists from the University of California, Davis, have examined animal and bird species data to figure out where they think the next virus outbreaks could happen – they decided West Nile Virus is most likely to affect North America, dengue South America, Japanese encephalitis Western Europe and yellow fever or Zika south-east Asia
Researchers from the University of California, Davis, have charted where they think future outbreaks of known viruses or similar strains will happen.
Viruses such as Zika, dengue and West Nile tend to be transmitted to people – at least in the first instance – from warm-blooded animals via mosquitoes.
Scientists have compared information about every known bird and mammal species on earth to work out which ones carry different types of viruses.
Working out where animals are most likely to be affected by certain viruses can provide clues about where they are most likely to take hold and spread to people.
They found Zika and yellow fever are most likely to break out in south-east Asia, particularly Indonesia and Malaysia, with other hot-spots in Europe and Africa.
People are at highest risk of West Nile Virus in the US, Mexico and the south of Canada, with a lower but not absent risk across Europe and Russia.
The St Louis encephalitis and Usutu viruses are also likely to be found in the same areas, the study found.
Dengue, which is common and can cause fever, vomiting and rashes, is most likely to break out in South America in Brazil and surrounding countries.
Yellow fever (YFV) and Zika (ZIKV) or similar viruses are most likely to break out in south-east Asia (red and orange), with some risk areas in Africa, Europe and South America (yellow)
West Nile Virus (WNV), St Louis encephalitis (SLEV) and Usutu (USUV) are all most likely to affect North America, according to the study, with some risk in eastern Europe and Russia as well
Tick-borne encephalitis (TBEV), an infection which can damage people's brains, is most likely to surface in Russia and northern Europe, researchers showed
According to the research, Western Europe is most at risk of an outbreak of Japanese encephalitis, a brain infection found in pigs which can cause seizures, paralysis and even death in severe cases in humans.
Tick-borne encephalitis, another brain infection, is also most likely to break out in Europe, though further to the east and into Russia.
When flaviviruses infect people they often cause fevers, headaches, tiredness and rashes, muscle or joint pain and some cause nausea or vomiting.
Most people only suffer
