Veterian Key

Ascariasis Basic Information   Definition Mange caused by a variety of mites, including the chorioptic (leg mange) and psoroptic families Synonym(s) Mange Epidemiology Genetics and Breed Predisposition Chorioptic mange typically affects…

Anthrax Basic Information   Definition Anthrax is an infectious disease caused by ingestion of spores of a bacterium that multiplies upon inoculation or ingestion and secretes lethal toxins. A spore is…

Anemia, Immune-Mediated Basic Information Definition Anemia resulting from a loss of erythrocytes caused by increased destruction by autoantibodies and complement. Synonym(s) • Autoimmune hemolytic anemia • Immune-mediated hemolytic anemia (IMHA)…

Atrioventricular Block, First Degree Basic Information Definition Delayed conduction of the supraventricular impulse at the level of the atrioventricular (AV) node, resulting in a prolonged PQ interval. Synonym(s) First-degree AV…

Aflatoxin Toxicosis Basic Information Definition Aflatoxins are hepatotoxic mycotoxins (mold toxins) produced by various Aspergillus spp. and other fungi, most commonly A. flavus and A. parasiticus. Aflatoxin can contaminate a…

Aminoglycoside Toxicosis Basic Information Definition The aminoglycosides are large molecules with numerous amino acid groups, making them basic polycations that are highly ionized at physiologic pHs. These physical properties are…

Adrenal Insufficiency, Relative Basic Information Definition Relative adrenal insufficiency (RAI) is a condition in which the adrenal gland, notably the adrenal cortex, is unable to respond (ie, secrete cortisol) to…

Anagen/Telogen Defluxion Basic Information Definition • Telogen defluxion is hair loss associated with the telogen phase (resting phase) of hair growth. • Anagen defluxion is the loss of hair during…

Actinobacillosis Basic Information Definition • Actinobacillus spp. is a gram-negative group of bacteria that causes a variety of clinical syndromes in horses. • Actinobacillus equuli subsp. equuli • Actinobacillus equuli…

Anaphylaxis Basic Information Definition A life-threatening acute immediate hypersensitivity reaction occurring as a result of the rapid release of inflammatory mediators from mast cells. Affected horses may develop acute respiratory…