Pneumonia is a common respiratory infection that inflames the alveoli. These sacs can accumulate fluid or pus, causing coughing, fever, difficulty breathing and chest pain. Pneumonia can range from mild to serious. Pneumonia occurs when bacteria, viruses, or fungi invade the alveoli in your chest.

Yellow fever is a serious viral illness transmitted through the bite of infected biting flies. Primarily found in tropical and subtropical regions of Africa and South America, this life-threatening illness can cause severe symptoms such as high temperature, yellowing of the skin, muscle aches, and t