So, when you get to the part of finding a cure and talk to Nettie you have some dialog options. When you attempt to use Persuasion option to convince Nettie that you dont show symptoms and have time, the Persuasion roll always fails. I have to meet or beat a roll of 10. I have load the save game 10 times and every time if fails. I never roll above a 10. The option to Dodge in the dialog before works as intended but the final dialog does not. Are you not giving us a choice but to attack Nettie?