Among the newer emerging infectious agents and diseases, many have already had a great impact, while others show potential for impact in the near future. Agents that have made a significant appearance, particularly in the 21st century, are considered in more depth below.
#1. Lower Respiratory Infections (deadly diseases)
Diseases like Pneumonia and others affecting the windpipe, lungs or the bronchial tubes are all categorized under the lower respiratory infections. These diseases shoot down more than 4 million lives every year. Most of these diseases are communicable which spreads through sneezing, coughing, laughing or exhaling. Annual mortality rate is 4 million. Source: en.wikipedia.org