online. we're getting warning about rare but brain eating infection that can be in rivers and lakes. this is another child infected. here are images of zach before he was hospitalized. more about his condition in a moment. first, this report from our senior medical correspondent, elizabeth cohen. >> reporter: high water temperatures, low water levels. the ideal breeding ground for this brain eating amoeba. health officials in florida issuing warning to be wary when swimming, jumping or diving. it's rare but they can go up the nose and into the brain causing meningitis. zach is battling the disease at miami children's hospital after contracting while knee boarding. >> he's fighting. she's strong. >> reporter: on facebook his