Elielson tries to calm down his baby brother Jose Wesley, in Bonito, Pernambuco state, Brazil. Jose Wesley struggles to feed, something common in children with neurological disorders like microcephaly. (AP Photo/Felipe Dana)

Larvicide, Not Zika Virus, Behind Spike In Microcephaly, Doctors Groups Warn

One Brazilian state halted use of the chemical which kills mosquitoes in drinking water, and agribusiness giant Monsanto distanced itself from rumors of ties to maker of the larvicide.