Прочитайте текст.
Pneumonia is an acute inflammation of the lung. It may be caused by bacteria or viruses. It may follow a cold and bronchitis, or may come on suddenly. It may also be a complication of measles or whooping cough. The child looks ill, has fever, cough, and very rapid breathing. He may also complain of pain in the chest. A doctor should be consulted, and depending on the severity the child may be treated at home or admitted to a hospital. If his breathing is very rapid, he may need oxygen. Most pneumonias can be treated with antibiotics. Pneumonia can be dangerous in a malnourished child, or in very young children, especially if it is due to an organism called staphylococcus.
Закончите предложение:
Pneumonia may be caused by …