Thousands of people have been infected with the Zika virus in the Americas, with Brazil the worst affected.
Latest reports say four Canadians returning from central and south America were also confirmed infected with the mosquito-borne virus, though a UN official says Zika is “linked to temperature”.
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“So you don’t have to be a rocket scientist to figure that if temperatures go up, there will be more of that kind of mosquito that carries the virus and there will be more infections.”
Zika has affected 23 countries or territories in the Americas.
And the WHO says the virus is spreading “explosively”, and could go even further afield amid an “extremely high” level of alarm.