It could be but usually is not. Nosocomial simply means that the infection [caused by any type of pathogen, including food-borne germs] was acquired in a health care setting, such as a hospital, lab,...
Nosocomial infections (also known as Healthcare-Associated Infections ~ HAI) are those which are contracted as a result of treatment in a hospital or hospital-like setting, such as a nursing home,...
The organisms causing most nosocomial infections usually come from the patient's own body (endogenous flora). They also can come from contact with staff (cross-contamination), contaminated...
There is no particular amount of Nosocomial infections unless you are asking about the most common. Nosocomial is the technical term for any infection that has been acquired while being hospitalized....