My uncle coughs constantly, and he has for as long as I've known him (he refuses to go to the doctor, for religious reasons). He's almost seventy years old. About ten minutes ago, he coughed directly at my face like three times. I'm worried, is it likely that I'll catch something? If so, is there anything I can do to prevent getting sick? I've lived with him for the past three years, and I haven't caught anything form him before.