what is a biological illness

A biological illness is a disorder of structure or function of an organism that is not a direct result of physical injury. It is a disturbance of the normal state of the body or mind, caused by genetic factors, disease, or autoimmune disorders. Biological disorders can be caused by bacteria, viruses, fungi, and other microorganisms. Some examples of biological disorders include albinism, anemia, asthma, and autoimmune disorders. Mental disorders are also considered biological illnesses, as they are caused by dysfunctions in brain circuits or neurobiological pathways. Biological weapons are a subset of a larger class of weapons sometimes referred to as unconventional weapons or weapons of mass destruction, which also includes chemical, nuclear, and radiological weapons.