Write a note on food borne diseases.

Foodborne illness (also foodborne disease and colloquially referred to as food poisoning) is any illness resulting from the food spoilage of contaminated food, pathogenic bacteria, viruses, or parasites that contaminate food, as well as chemical or natural toxins such as poisonous mushrooms.

The basic definition of an emerging or re-emerging infectious disease is a disease whose incidence has increased in a defined time period and location. If the disease was unknown in the location before, the disease is considered to be emerging. However, if the disease had been present at the location in the past and was considered eradicated or controlled, the disease is considered to be re-emerging. Diseases considered to be emerging or reemerging include avian influenza, West Nile virus, bovine tuberculosis in wildlife etc.

Recognition of an emerging disease can occur because the disease is present in the population for the first time, because the disease has been detected for the first time, or because links between an infectious agent and a chronic disease or a syndrome have only recently been identified. Many of these emerging diseases are zoonotic, and rely on animal populations as reservoirs of infection.

Most emerging infections are caused by pathogens already present in the environment, brought out of obscurity or given a selective advantage by changing conditions and afforded an opportunity to infect new ______ ___ ______ _________ __________.
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