Pneumonia as seen on chest x-ray. A: Normal chest x-ray. B: Abnormal chest x-ray with shadowing from pneumonia in the right lung (left side of image).<unk>  <unk>  or nosocomial pneumonia refers to any pneumonia contracted by a patient in a<unk>  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.<unk>  is the second most common nosocomial infection (after urinary tract infections) and accounts for 15–20% of the total. It is the most common cause of death among nosocomial infections and is the primary cause of death in intensive care units.<unk>  typically lengthens a<unk>  stay by 1–2 weeks.
Hospital-acquired pneumonia
Community-acquired pneumonia
Ventilator-associated pneumonia
Idiopathic pneumonia syndrome
Pneumococcal pneumonia
Bacterial pneumonia
Hantavirus pulmonary syndrome
Aspiration pneumonia