Originally published February 27, 2015By Nadia M. WhiteheadA virus that originated in sub-Saharan Africa now threatens the health of U.S.-Mexico border communities.Dubbed chikungunya (pronounced chicken-goon-yuh), the mosquito-borne virus has crept northward toward the U.S. border since its arrival in the Caribbean in 2013; its spread into the U.S. seems inevitable.'I would be very surprised if chikungunya isn't in the Rio Grande Valley by next summer,' virologist Weaver, who runs the Inst....