The World Health Organisation has declared Zika to be a global health emergency.
More than two billion people are at risk of developing the Zika virus, scientists have warned. Data on air traveller numbers, analysed by scientists and published in The Lancet Infectious Diseases, found “vast numbers” of people are vulnerable.
People living in India, Indonesia and Nigeria are the most vulnerable to transmission, the research found. It is thought this risk is particularly heightened in summer as people are more likely to engage in travel, especially over long distances.
The number of people travelling to a population can affect likelihood of contracting the virus. Limited access to health resources in countries with high poverty rates and poor infrastructure is another factor, with the Philippines, Vietnam, Pakistan and Bangladesh being most affected by such conditions.
Around the world, more than 70 countries and territories now have continuing Zika transmission. The World Health Organisation has declared it to be a global health emergency. There is currently no known vaccine or drug treatment for it.
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Zika was first identified in monkeys in Uganda in 1947. Although outbreaks have occurred since, the current spread is on an unprecedented scale. The recent outbreak was first seen in May 2015 in Brazil. More than 50 cases have been noted in the UK so far.
Zika is spread by the Aedes aegypti mosquito, resulting in quick transmission between people, especially in high-density populations. The World Health Organisation has warned it can also be transferred during sexual contact.
The report’s authors said: “As the Zika virus epidemic in the Americas intensifies and expands, hundreds, and possibly thousands, of infected travellers are now transporting the virus to distant regions of the world. Given the broad global range of aedes mosquitoes and the arrival of summer in the northern hemisphere, these translocation events could catalyse new Zika virus epidemics, in much the same manner that the epidemic in Brazil began.
“The potential for epidemics to occur in parts of Africa and the Asia-Pacific region is particularly worrying given the vast numbers of people who are potentially susceptible to Zika virus and are living in environments where health and human resources to prevent, detect, and respond to epidemics are limited. Our findings could offer valuable information to support time-sensitive public health decision-making at local, national, and international levels.”
In the absence of any effective treatments or vaccines for the disease – and given past failures to eradicate it, it will largely be up to individuals to avoid infection.
WHO said it was also unknown just how big the risk is for pregnant women. Although Zika has been proven to cause a range of neurological problems in babies, various studies have put the risk anywhere from 1 to 30 percent. “We don’t have a definitive answer,” said Dr. Peter Salama, WHO’s director of emergencies. “The risk is relatively low, but significant.”
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