24. Define the following Term: Infection, Contamination, pollution, Infestation infectious, Disease, contagious disease, communicable disease, Epidemic, Endemic, and Sporadic

       Pandemic, zoon sis, ICDDR, B. 

Ans: Infection: Infection is the entry and multiplication of an infectious agent host. 

Contamination: The presence of an infectious agent an a body surface, also on or in clothes beddings toys surgical instruments or dressings, or other inanimate articles or substance including water, milk and food.

Pollution: Pollution is the presence of offensive, but not necessarily infectious agent in the environment.

Infestation infectious: A clinical manifested disease of a host resulting form an infection.

Disease: It is a state of dysfunction subjectively or objectively apparent and looked upon as maladjustment of the host to the existing environment.

Contagious disease: A disease that is transmitted though contact, e.g. scabies, trachoma, STD, leprosy etc.

Communicable disease: An illness due to a specific infectious agent or its toxic products capable of being directly or indirectly transmitted form man to man animal to animal, or form the environment (through air, dust, soil, water, food etc.) to man or animal. 

Epidemic: The ‘unusual’ occurrence in a community or region of disease, specific health-related behavior (e.g. smoking) or other health-related events (e.g. traffic accidents) clearly in excess of “expected occurrence”.