Hospital-acquired pneumonia (HAP), also known as nosocomial pneumonia, is a lower respiratory bacterial infection that occurs 48 hours or more after hospital admission and does not appear due to intubation at the time of admission.

Hospital-acquired pneumonia (HAP) or nosocomial pneumonia refers to any pneumonia contracted by a patient in a hospital at least 48–72 hours after being admitted. It is thus distinguished from community-acquired pneumonia. It is usually caused by a bacterial infection, rather than a virus. [1][2]

What is hospital-acquired pneumonia (HAP)? HAP is a lung infection that can develop while you are in the hospital. HAP occurs 48 hours or more after you are admitted. Your lungs become swollen and cannot work well. HAP is usually caused by bacteria. It can become life-threatening.

Hospital-acquired pneumonia (HAP), or nosocomial pneumonia, is a lower respiratory infection that was not incubating at the time of hospital admission and that presents clinically 2 or more days after hospitalization.