Infectious diseases is a medical specialty that deals with infections caused by micro-organisms such as bacteria, viruses, fungi and parasites that result in human illnesses. These diseases can spread from person to person directly or indirectly, by close contact through the air, or through direct contact with an infected person. Infectious diseases cause a wide spectrum of illnesses and can spread in a variety of ways. Some diseases can be treated at home using antibiotics and other medications, but some will need to be treated in a hospital in isolation and away from other people. This is to help contain and prevent the disease from spreading. Examples of infectious disease include Hepatitis B and C
, dengue fever,
tuberculosis and influenza.