BOGOTA, Colombia (AP) — Colombia's President Juan Manuel Santos said this weekend that there's no evidence of Zika causing any cases of the birth defect known as microcephaly in his country, though Zika has diagnosed 3,177 pregnant women with the virus.

Santos also announced that a U.S. medical team will arrive in Colombia to help investigate the mosquito-borne virus.

Brazilian officials say they suspect that Zika is behind an unusual number of microcephaly cases, in which children are born with unusually small heads and brain damage. The link is not confirmed.

Santos said Zika apparently has affected more than 25,600 Colombians overall. Colombian officials said three people had died of the paralyzing Guillain-Barre syndrome they attributed to cases of Zika.

The mosquito-borne virus has spread to more than 20 countries in the Americas.

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