Top 10 Deadliest Diseases Recorded in History

4. Chronic Obstructive Pulmonary Disease:

This disease occurs as a result of a poor airflow into the lungs for a long time. Its main symptoms include short breath and cough with sputum. The disease usually worsens by the day. In the long run, some activities become difficult such as walking up the stairs. The disease has killed well over 3.17 million people.

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