What is disease?

Disease is any abnormal condition, affecting either the whole body or any of its parts, which impairs normal functioning. The following are classes of diseases. For individual diseases, see specific names.
communicable d. Any disease transmissible by infection or contagion directly or through a carrier of the pathogen.
congenital d. A disease present at birth.
contagious d. A disease transmissible by direct or indirect contact.
deficiency d. A disease due to a prolonged lack of vitamins, minerals, or any other
essential dietary component.
hereditary d. A disease transmitted genetically from parent to offspring.
infectious d. A disease caused by the presence of a pathologic microorganism.
mental d. See mental disorder, under disorder.
occupational d. A disease caused by the environment of a particular occupation.
organic d. Disease involving structural changes in the body.
periodic d. Any disease that recurs regularly.
sexually transmitted d.’s Diseases spread by intimate contact; many can be acquired transplacentally by the fetus or through contact with maternal secretions by the newborn; causative microorganisms include herpesvirus 1 and 2, cytomegalovirus, Chlamydia, group B Streptococcus, molluscum contagiosum virus, Sarcoptes scabiei, hepatitis viruses, and human immunodeficiency virus. Also called venereal diseases.
systemic d. A disease affecting several organs or the entire body.
venereal d. See sexually transmitted diseases.

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