Hi there. Just fyi, UTI's are not contagious. :>) Impossible to catch that from her. As to a respiratory infection---- well, if it is an infection, that also is something less contagious. We pass viruses back and forth. So, if she has a cold, that is something you could catch. If it is an infection and she is on antibiotics, it is probably a cold that turned into a secondary infection. meaning, the mucus got trapped in her chest or sinuses and then became bacterial.