| HAV | <virology> An RNA virus (hepatovirus) in the family Picornaviridae, that is the causative agent of viral hepatitis type A. The virus replicates in hepatocytes and is presumed to reach the intestine via the bile duct. Transmission occurs by the faecal-oral route. Synonym: infectious hepatitis virus. (20 Sep 2002) |
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| Haverhill fever | <microbiology> An infection by Streptobacillus moniliformis marked by initial chills and high fever (gradually subsiding), by arthritis usually in the larger joints and spine, and by a rash occurring chiefly over the joints and on the extensor surfaces of the extremities. Haverhill fever is used to indicate Streptobacillus moniliformis infections not associated with rat bite resulting from contaminated food or water. Synonym: erythema arthriticum epidemicum. Origin: Haverhill, MA, where an epidemic occurred in 1926 (05 Mar 2000) |
| Haverhillia multiformis | A species commonly found as an inhabitant of the nasopharynx of rats; it occurs as the aetiologic agent of an epizootic septic polyarthritis in mice and of one type of rat-bite fever; it is the type species of the genus Streptobacillus. (05 Mar 2000) |
| Havers' glands | <anatomy> Collections of adipose tissue in the hip, knee, and other joints, covered by synovial membrane, thought by Havers to be gland's secreting the synovia. Synonym: synovial glands. (05 Mar 2000) |
| Havers, Clopton | <person> British anatomist, was a London physician, but he also qualified in Utrecht in 1685 in which year he was made a Fellow of the Royal Society. Lived: 1650-1702. See: haversian canals, Havers' glands, haversian lamella, haversian spaces, haversian system. (05 Dec 1998) |
| haversian | Pertaining to, or discovered by, Clopton Havers, an English physician of the seventeenth century. (01 Mar 1998) |
| haversian canals | <anatomy> The small Vascular canal's that run longitudinally in the centre of haversian systems of compact osseous tissue, through which the blood vessels ramify in bone. Synonym: Leeuwenhoek's canals. (05 Mar 2000) |
| haversian lamella | One of the concentric tubular layers of bone surrounding the central canal in an osteon. Synonym: haversian lamella. (05 Mar 2000) |
| haversian spaces | <anatomy> Space's in bone formed by the enlargement of haversian canals. (05 Mar 2000) |
| haversian system | <anatomy> The basic unit of structure of compact bone, comprising a haversian canal and its concentrically arranged lamellae, of which there may be 4 to 20, each 3 to 7 microns thick, in a single haversian system. A haversian canal is a freely anastomosing channel in compact bone containing blood vessels and running longitudinally in the centre of haversian systems of compact osseous tissue. It was originally described by Clopton Havers, an english physician, in 1691. (12 Dec 1998) |
| HAVRIX | <virology> A vaccine against hepatitis A made of killed hepatitis a virus to stimulate the body's immune system to produce antibodies against the hepatitis a virus. (12 Dec 1998) |