<unk>  is common worldwide, and is a major cause of death in all age groups. In children, most deaths (over two million a year) occur in the newborn period. According to a World Health Organization estimate, one in three newborn deaths result from pneumonia. Mortality decreases with age until late adulthood, with the elderly at risk for<unk>  and its associated mortality. More<unk>  cases occur during the winter than at other times of the year.<unk>  is more common in males than females, and more common in black people than Caucasians. Patients with underlying illnesses (such as Alzheimer's disease, cystic fibrosis, COPD, tobacco smoking, alcoholism or immune-system problems) have an increased risk of developing pneumonia.
Community-acquired pneumonia
Hospital-acquired pneumonia
Pneumococcal pneumonia
Bacterial pneumonia
Fungal pneumonia
Idiopathic pneumonia syndrome
Ventilator-associated pneumonia
Hantavirus pulmonary syndrome