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This lung disease is caused by an infection in the air sacs in the lungs. The infections can be caused by bacteria, a virus or a fungi. According to the American Lung Association, most people can recover in one to three weeks, but it can be life threatening. Symptoms, which include cough, fever, shaking chills and shortness of breath, can range from mild to severe. Suggested ways to prevent developing this respiratory condition include washing hands frequently, getting a flu shot or, for those at high-risk of pneumonia, receiving vaccinated.