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formerly the suggested symbol for the name hahnium, which was applied variously to two elements, now called dubniumdubnium
, artificially produced radioactive chemical element; symbol Db; at. no. 105; mass number of most stable isotope 268; m.p., b.p., and sp. gr. unknown; valence +5.
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 and hassiumhassium
, artificially produced radioactive chemical element; symbol Hs; at. no. 108; mass number of most stable isotope 277; m.p., b.p., sp. gr., and valence unknown. Situated in Group 8 of the periodic table, it is expected to have properties similar to those of osmium.
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Abbrev. for hour angle.




References in periodicals archive ?
Hepatitis A vaccines are not mandatory for schoolchildren, but parents can get them for their children at county immunization clinics, he said.
Unlike (hepatitis) B or C, which can live chronically in the liver and cause longer-term effects, hepatitis A doesn't do that,'' said Dr.
Because hepatitis A is caused by a virus, treatment consists of addressing the symptoms, including diarrhea and dehydration, Gomez said.
Karen Maiorca, director of nursing for the Los Angeles Unified School District, said the 722,000-pupil district reported only 17 cases of hepatitis A since July 1, 2001.
All foodhandlers at the restaurant were tested for IgM anti-HAV; one employee, who was IgM anti-HAV-positive, denied symptoms of and risk factors for hepatitis A.
Because primary/secondary-case status and infectiousness of the IgM anti-HAV-positive foodhandler were unknown and because her hygiene and foodhandling practices were questionable, the local health department recommended administration of IG to all patrons who had eaten at the restaurant within 2 weeks before the association between hepatitis A and the restaurant had been determined.
In May 1989, the Seattle-King County Department of Public Health (SKCDPH) received reports of and investigated 213 cases of hepatitis A -- a threefold increase over the average of 68 cases reported in each of the first 4 months of 1989.
Editorial Note: The outbreaks reported here illustrated two principal modes of transmission associated with foodborne hepatitis A outbreaks: 1) contamination of food during preparation by a foodhandler infected with hepatitis A virus and 2) contamination of food, such as shellfish, before it reaches the food service establishment.