<prompt> Commonest cause of nosocomial infection isPseudomonasStaphylococciKlebsiellaEnterobacteriaceae  <response>: According to the CDC, the most common pathogens that cause nosocomial infections are Staphylococcus aureus, Pseudomonas aeruginosa, and E. coli. Some of the common nosocomial infections are urinary tract infections, respiratory pneumonia, surgical site wound infections, bacteremia, gastrointestinal and skin infections. Ref: Ananthanarayana panikers 10th edition 