 [ Symptoms ] do mushrooms have nutritional value which taste the best [ Disease ] exposure to any bacteria does not necessarily imply that you wil get a disease from it there are not specific bacteria that only cause pneumonia so exposure to someone with pneumonia does not mean the exposed person will get pneumonia bacteria and viruses are more prevalent in closed spaces and can last for a while on surfaces but we are all exposed to these types of germs every day every hour when we are around people even people that appear well your mother is elderly and her immune system may be more vulnerable did she get the flu vaccine this year has she had the pneumonia vaccine pneumovax if not this would be something that her doctor would likely recommend if your mother becomes ill she should be seen by her medical provider and carefully examined but do not worry too much about this exposure she may be tougher than she looks and may not get ill at all