There’s more evidence that untreatable or tough-to-treat infections from a rare but deadly superbug are on the rise in U.S. hospitals, ratcheting up concerns about stopping the spread before it gets worse, health officials said.There’s more proof that untreatable or tough-to-treat infections from a uncommon but deadly superbug are on the upward push in U.S. hospitals, ratcheting up concerns about stopping the unfold before it will get worse, health officials stated.