| nematode infections | Infections by nematodes, general or unspecified. (12 Dec 1998) |
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| nematode | Infection by the nematode Ascaris lumbricoides and is characterised by an early pulmonary phase related to larval migration and a later, prolonged intestinal phase. Adult worms are 15-40 cm in length and maintain themselves in the lumen of the small intestine. Infection occurs after ingesting eggs contained in contaminated food or more commonly, by transmission to the mouth by the hands after contact with contaminated soil. Treatment is with mebendazole or pyrantel pamoate. (27 Sep 1997) |
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| nematode sperm | The nematode Caenorhabditis elegans has an unusual amoeboid spermatozoon that is actively motile yet appears to lack both actin and tubulin. (18 Nov 1997) |
| acinetobacter infections | Infections with bacteria of the genus acinetobacter. (12 Dec 1998) |
| actinobacillus infections | Infections with bacteria of the genus actinobacillus. (12 Dec 1998) |
| actinomycetales infections | Infections with bacteria of the order actinomycetales. (12 Dec 1998) |
| adenophorea infections | Infections with nematodes of the subclass adenophorea. (12 Dec 1998) |
| adenovirus infections, human | Respiratory and conjunctival infections caused by 33 identified serotypes of human adenoviruses. (12 Dec 1998) |
| aids-related opportunistic infections | Opportunistic infections found in patients who test positive for human immunodeficiency virus (HIV). The most common include pneumocystis carinii pneumonia, kaposi's sarcoma, cryptosporidiosis, herpes simplex, toxoplasmosis, cryptococcosis, and infections with mycobacterium avium complex, microsporidium, and cytomegalovirus. (12 Dec 1998) |
| alphavirus infections | Virus diseases caused by members of the alphavirus genus of the family togaviridae. (12 Dec 1998) |
| anaplasmataceae infections | Infections with bacteria of the family anaplasmataceae. (12 Dec 1998) |
| arbovirus infections | Infections caused by arthropod-borne viruses, general or unspecified. (12 Dec 1998) |
| arenaviridae infections | Virus diseases caused by the arenaviridae. (12 Dec 1998) |
| arterivirus infections | Infections caused by viruses of the genus arterivirus. (12 Dec 1998) |
| ascaridida infections | Infections with nematodes of the order ascaridida. (12 Dec 1998) |
| astroviridae infections | Infections with astrovirus, causing gastroenteritis in human infants, calves, lambs, and piglets. (12 Dec 1998) |