Story highlights
- The female anopheles mosquito killed 438,000 people in 2015 alone
- Faso Soap uses natural ingredients to repel the deadly insect
- The Burkina Faso-based start-up is taking the product through rigorous scientific testing
- It could eventually be used to fight Zika
(CNN)It's just a little sting, so slight often the victim doesn't even feel it.
But it's administered by the most dangerous animal in the world -- the female anopheles mosquito.