Communicable diseases are also called contagious diseases. These are infectious diseases due to bacteria, virus, fungus, protozoan and parasites. These diseases can be transmitted by direct contact with infected person or through contaminated, foods, liquids, body fluids, airborne inhalation, objects and through vector born spread. These diseases are TB, HIV, sexually transmitted diseases, flu, MRSA, meningitis, malaria, Lyme disease, and many more.