<prompt> After how many hours of hospital admission does nosocomial infection occur?24 hours36 hours48 hours72 hours  <response>: Nosocomial infections can be defined as those occurring within 48 hours of hospital admission, 3 days of discharge or 30 days of an operation. They affect 1 in 10 patients admitted to hospital. Nosocomial comes from the Greek word nosokomeion meaning hospital nosos disease, komeo to take care of . This type of infection is also known as a hospital-acquired infection. 