Pneumonia is a serious, sometimes fatal, lung infection that causes fever, cough, or difficulty breathing. Pneumonia is spread by tiny droplets in the air after an infected person coughs or sneezes. You can protect yourself by getting vaccinated at any time of the year for long-term protection of the disease. Recommended for: All adults 65+ Adults 18+ with risk factors including diabetes, chronic lung disease, chronic heart disease, asthma, COPD, autoimmune disease, and others. Babies and children younger than 2.