Zika virus — Worldwide/Unknown
The risk for an outbreak was considered to be the function of two main components: (1) the likelihood of local Zika virus transmission and (2) the capacity of countries to contain transmission at an early stage. A local transmission likelihood score was derived from the presence of and climatic suitability for _Aedes aegypti_ and _Ae. albopictus_ (the two species of _Aedes_ mosquitos known to be competent vectors for Zika virus) and factors related to the introduction and onward transmission
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