What is Hansen's disease (etiological agent, mode of transmission, clinical manifestations and prevention)?

The etiological agent of Hansen's disease is bacteria known as Mycobacterium leprae. The mode of transmission is not yet totally called but it is believed that respiratory secretions and saliva drops can spread the disease. Hansen's disease is a chronic disease (slow progression) that usually attacks the skin and the peripheral nerves although other areas of the body can be affected. In the skin nodules, reddish spots, thickening of the dermis and lack of sensitivity appear; the mucosae, especially the nasal mucosa, might be injured and also the viscera might be affected. The main form of prevention is information, as there is available treatment; infected people should, as soon as possible, look for health services for evaluation and treatment of the disease.