This is a hard one to believe, but according to the current Walgreens Flu Index, the four counties that comprise the RGV currently have the highest number of flu cases in the entire U.S.Four Valley cities where the influenza virus is especially active include Brownsville, Harlingen, Weslaco, and McAllen. The story was first reported Oct. 25 by KURV Radio.On a sad note, a threeyear- old girl died last week with acute respiratory symptoms after testing positive for the flu virus, according to a story published Oct. 19 at ValleyCentral.com. The state will ultimately decide the cause of death, which could ...