Brazilian health officials and the World Health Organization are denying links between a well-known pesticide and microcephaly, a condition that causes babies to develop abnormally small heads and leads to death in some cases. The pesticide is called Pyriproxyfen, and it’s used in water tanks to eliminate mosquito larvae.

Brazilian health officials and the World Health Organization are denying links between a well-known pesticide and microcephaly, a condition that

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