GOOD: Zika Infection in U.S. Is Still Rare So Far, Blood Donations Indicate. “Screenings in a dozen states suggest that Zika infection remains exceedingly rare. Among the approximately 800,000 blood donations tested in the past six months or so, about 40 were initially positive for the virus.”

On the other hand, there’s this: “Still, she noted, it may not be surprising there are so few possibly positive cases, because blood banks have been dissuading people from donating if they recently traveled to an area in which the virus is circulating.”