I am a transplant patient and my mother has a form of tuberculosis normally not congatious but due to my compromised immune system I have been told that there is a very real possibility that I can contract it. Being in the middle stages of alzheimers, she has a problem drinking only from her cups. My last visit I found that she had been using the cup from which I was drinking. Is there reason to be concerned and so, what incubation time should I look for?