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A general response to this general question is: ALL Infectious Diseases are caused by harmful bacteria, viruses, fungi, or parasites. Here are some examples of the bacterialinfectious diseases: streptococcal pharyngitis (strep throat), cholera, syphilis, tuberculosis, salmonellosis, and numerous other illnesses.Sometimes, when the immune system is weakened, a human body can acquire an illness caused by the bacteria that are not considered harmful or virulent. The immune system may be weakened by any health issue:

a) a previous infection; e.g. flu, bacterial or viral pneumonia, gastroenteritis;

b) malnutrition; e.g. unhealthy diet (e.g. lack of vitamins and/or proteins), starvation; gastrointestinal diseases that prevent properabsorptionof vitamins or nutrients, etc.

c) diseases that target the immune system specifically: AIDS (caused by a human immunodeficiency virus), variousautoimmune diseases may also affect a healthy immune response to pathogens, allergic diseases weaken the immune system, etc.


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12y ago

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