#infectious disease

• Actinomycosis — A chronic, non-contagious structural bacterial infectious disease caused by anaerobic or microaerophilic bacteria of the genus Actinomyces (most commonly Actinomyces israelii), which normally colonize human mucous membranes. The condition manifests through the development of hard inflammatory granulomas and pseudotumoral suppurative abscesses that drain via fistulous tracts a characteristic pus containing yellow granules ('sulfur granules'), most frequently localizing cervicofacially (mouth and neck), thoracically, or abdominally following local trauma.
• Adenovirus infection — An infectious and contagious disease caused by adenoviruses, structurally and functionally affecting the mucous membranes of the respiratory, digestive, or ocular tracts, as well as the associated lymphoid tissue. This condition manifests clinically through a variety of syndromes, including pharyngitis, conjunctivitis (pharyngoconjunctival fever), gastroenteritis, or mesenteric adenitis, being particularly common among children.
• AIDS — International medical acronym for 'Acquired Immunodeficiency Syndrome', a chronic and potentially life-threatening condition caused by the human immunodeficiency virus (HIV). The virus structurally destroys the cells of the immune system, depriving the body of its capacity to fight opportunistic infections and malignancies, with the AIDS stage representing the advanced clinical phase of the infection.
• Amoebic — Relating to amoebae, of the nature of amoebae, or caused by amoebae; a structural adjective describing biological processes (locomotion, movement), pathological manifestations (infections, abscesses), or parasitic species associated with protozoans of the class Rhizopoda.
• Anti-cholera — Preventing, combating, or curing cholera; a vaccine, medical serum, or pharmaceutical treatment utilized to destroy the Vibrio cholerae bacterium or to immunize the organism against it. In a clinical sense, it intervenes structurally by stimulating the production of specific antibodies within the intestinal mucosa.
• Anti-infective — Preventing, combating, destroying, or halting the multiplication of pathogenic agents responsible for triggering an infection (bacteria, viruses, fungi, or protozoa); a synthetic medication or natural remedy capable of sterilizing an infectious focus. In a clinical sense, it includes antibiotics, antivirals, antifungals, and topically applied antiseptics.
• Antisyphilitic — Intended for preventing, combating, destroying, or curing lues (syphilis); a medication, antibiotic (especially penicillin), or treatment utilized for eradicating the bacterial infection caused by the spirochete Treponema pallidum. In a clinical sense, it prevents the disease's evolution toward secondary and tertiary stages and protects nervous and cardiovascular integrity.
• Antimalarial — Preventing, combating, destroying, or curing malaria; a medication (such as quinine, chloroquine, or artemisinin) utilized in the prophylaxis and therapy of parasitic infections caused by protozoa of the genus Plasmodium, transmitted via the Anopheles mosquito bite. In a clinical sense, it intervenes structurally by blocking the parasite's replication cycle within erythrocytes or hepatic cells.
• Antimicrobial — Destroying pathogenic microorganisms (bacteria, viruses, fungi, protozoa) or preventing their multiplication and development; a broad class of pharmaceutical substances or chemical cleaning agents utilized for sterilization and treatment. In a clinical sense, it includes antibiotics, antivirals, and disinfectants, acting structurally to protect the host organism from infection.
• Anthrax — An acute and highly severe infectious disease, common to humans and animals, caused by the spore-forming bacterium Bacillus anthracis. The condition is transmitted through direct contact with infected animals or contaminated products and can manifest in cutaneous (malignant pustule), pulmonary, or gastrointestinal forms, carrying a high mortality rate without early antibiotic treatment.
• Arsenotherapy — An archaic or historical therapeutic method consisting of the controlled medical use of arsenic and its organic or inorganic compounds to treat certain serious diseases; it was widely utilized in the early 20th century, particularly in combating syphilis (via Salvarsan invented by Paul Ehrlich), malaria, and some tropical parasitic diseases, prior to the discovery and widespread introduction of modern antibiotics.
• Arthrosyphilis — A specific joint localization of the Treponema pallidum infection, characterized by inflammatory, degenerative, or destructive manifestations within bone and synovial structures, occurring as a complication in the secondary or tertiary stages of syphilis. This rare infectious pathology can take the form of acute arthritis, chronic bilateral hydrarthrosis (Clutton's joints in congenital forms), or severe destructive neurological degradation (Charcot joint in tabes dorsalis).
• Bacillus — A rod-shaped, cylindrical bacterium with straight, rounded, or slightly concave ends, belonging in a broad sense to the class Bacilli, comprising numerous pathogenic or saprophytic microorganisms. These biological agents can be aerobic or anaerobic and are responsible for causing severe infectious diseases in human and animal organisms, such as tuberculosis, anthrax, tetanus, or leprosy, while also playing crucial roles in industrial fermentation processes.