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How are diseases caused?
 Diseases are caused from outside with food, air, water, medications, etc.
    Produced in our body as a result of its own life processes and life processes of bacteria living in it.
Infectious diseases can be caused by:

Bacteria. These one-cell organisms are responsible for illnesses such as strep throat, urinary tract infections and tuberculosis.
    Viruses. Even smaller than bacteria, viruses cause a multitude of diseases — ranging from the common cold to AIDS.
    Fungi. Many skin diseases, such as ringworm or athlete's foot, are caused by fungi. Other types of fungi can infect your lungs or nervous system.
    Parasites. Malaria is caused by a tiny parasite that is transmitted by a mosquito bite. Other parasites may be transmitted to humans from animal feces.


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