Contacts of leprosy Contact by touching the touch and close contact with the patient for a long time. Leprosy is very small, not visible with the naked eye, living under the skin. Peripheral Neuropathy and mucous membranes of the upper respiratory patient contact. Leprosy on the body Incubation takes about 3-5 years to show symptoms in people with no immunity to leprosy. Most people have immunity to leprosy. Children have the chance of infection than adults. Because the antibodies less. Exposed to disease or the general public will get a chance to leprosy patients, with only about 5 percent only.