Zika: how the virus's ability to spread in the US is remarkably easy

All it takes is for an already infected person to be bitten by a species of carrier mosquito, which thrive in the south. Two entomologists discuss the potential of a US public health crisis and the challenges of eradicating the mosquitoes

As Brazilian authorities admit they are "badly losing the battle against the mosquito", local insect experts say it would be remarkably easy for the Zika virus to begin spreading in the US.

Related: Zika virus: its effects, how it is spread, and the possible threat to women