SciQuest.org

The answer is #3, Leprosy. Leprosy, also known as Hansen's disease, is a chronic infectious bacteria that affects peripheral nerves, the respiratory tract lining and skin. Interestingly, only about 5% of people who are infected with the disease actually develop any symptoms. The mode of transmission is unknown, thought to be by respiratory droplets. Treatment with oral antibiotics is effective in treating Leprosy.