Infectious diseases are illnesses caused by microorganisms such as bacteria, viruses, fungi, or parasites. Cholera is an infectious disease caused by the bacterium Vibrio cholerae, which is typically spread through contaminated water or food. Leprosy is an infectious disease caused by the bacteria Mycobacterium leprae, which can cause severe disfigurement and nerve damage. MEASLES is an infectious disease caused by the virus Morbillivirus, which is highly contagious and can cause serious complications. MUMPS is an infectious disease caused by the virus Paramyxovirus, which is spread through saliva and can cause swelling of the salivary glands. TETANUS is an infectious disease caused by the bacterium Clostridium tetani, which is usually contracted through a wound and can cause muscle spasms and difficulty breathing. Dengue is an infectious disease caused by the virus Flavivirus, which is spread by mosquitoes and can cause fever, joint pain, and rashes.