David Carmon never knew what bit him. Many days would pass before the Gainesville man and his wife, Jessie, would know the culprit — a mosquito infected by West Nile virus. And by that time, David was fighting for his life. The virus that entered his system over the Labor Day weekend in 2018 would go on to wreck the 53-year-old’s body, leaving him paralyzed and fighting to breathe — just struggling to survive. “It’s a very devastating disease,” he said in an interview last week, confined to a wheelchair and only able to speak because of a valve connected to a tracheostomy tube at the base of his throat. Progress is being made, but slowly.