| − | '''Pneumonia''' is an inflammation of the lungs characterized by [[fever]], chills, muscle stiffness, chest pain, cough, shortness of breath, rapid heart rate and difficulty in breathing.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#p</ref> | + | '''Pneumonia''' is an inflammation of the lungs characterized by [[fever]], chills, muscle stiffness, chest pain, cough, shortness of breath, rapid heart rate and difficulty in breathing.<ref>https://www.cdc.gov/vaccines/about/terms/glossary.htm#p</ref> |