Brazil's health authorities are using guppy fish, which eat mosquito larvae, to slow the spread of the Zika virus that is suspected of causing birth defects in thousands of babies.
Ashraf Fahim reports.
Brazil's health authorities are using guppy fish, which eat mosquito larvae, to slow the spread of the Zika virus that is suspected of causing birth defects in thousands of babies.
Ashraf Fahim reports.