June 3 (Reuters) - World number one golfer Jason Day on Friday expressed doubts for the first time over whether he would compete at this summer's Rio Olympics, citing fresh concerns over the Zika virus.
Australian Day had previously been vocal in his support for golf's return to the Olympics after an absence of more than a century but he and his wife, Ellie, want to make "an educated decision" as they consider having a third child.
U.S. health officials have concluded that infections by the mosquito-borne Zika virus in pregnant women can cause microcephaly, a birth defect marked by small head size that can lead to severe developmental problems in babies.