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Biomedical subjects

H Artsob

Publications and source records attributed to H Artsob.

At least 55 records · Page 3Linked to original sources
PubMed1984

Serological evidence of infection with California serogroup viruses (family Bunyaviridae) in residents of Long Hua, suburb of Shanghai, People's Republic of China.

Sera from 126 residents of Long Hua, a suburb of Shanghai, in the People's Republic of China, were studied. Sera were tested for haemagglutination inhibiting antibodies to alphavirus (eastern equine encephalitis, western equine encephalitis), flavivirus (St. Louis encephalitis, Powassan, dengue) and California serogroup (snowshoe hare) antigens. Flavivirus antibodies were found in 14 (11.1%) and California serogroup antibodies in 5 (3.9%) individuals. Neutralizing antibodies with highest titres to snowshoe hare virus were demonstrated in 3 of the 5 California serogroup reactors. We believe this to be the first report of California serogroup virus antibodies in Chinese residents and the first evidence to suggest that California serogroup viruses may be circulating in the Orient.

Adolescent↗
PubMed1984

Enzyme-linked immunosorbent assay typing of California serogroup viruses isolated in Canada.

A procedure was developed to type California serogroup viruses by an antibody-capture, enzyme-linked immunosorbent assay. Seven California serogroup members from North America were distinguished, including snowshoe hare, La Crosse, California encephalitis, San Angelo, Jamestown Canyon, Keystone, and trivittatus. Extensive cross-reactions were observed between Jamestown Canyon and the closely related South River strain. The enzyme-linked immunosorbent assay method was successfully applied to the typing of 77 California serogroup viruses isolated in Canada, including 61 snowshoe hare, 13 Jamestown Canyon, and 3 trivittatus topotypes.

Animals↗
PubMed1983

Powassan virus encephalitis resembling herpes simplex encephalitis.

A boy from New York traveling in Nova Scotia had olfactory hallucinations and other signs of temporal lobe involvement, leading to a diagnosis of herpes simplex encephalitis. The patient was treated with vidarabine and made a complete recovery. However, hemagglutination inhibition, complement fixation, and neutralization tests identified Powassan virus (POW) as the pathogen. Shortly before his trip to Nova Scotia, the patient had traveled in an area where POW encephalitis had occurred in humans (the eastern part of the state of New York), and he also came in contact with a known reservoir of POW infection (a groundhog) at home.

Child↗
PubMed1981

Antibodies to the California group of arboviruses in the moose (Alces alces americana Clinton) population of Nova Scotia.

Moose (Alces alces americana Clinton) blood collected by hunters during the 1977 and 1978 hunting seasons was tested for California group antibodies. Hemagglutination inhibition (HI) tests using snowshoe hare virus (SSH) as antigen yielded 37.02% HI-positive sera. Neutralization tests showed reactors reactors (67.5% positive) to SSH and classified six reactors as Jamestown Canyon virus (JC). This study reports the first finding of JC in a moose population; it also provides the first evidence of JC in Atlantic Canada and supports previous findings of SSH in Nova Scotia.

Animals↗
PubMed1981

Antibodies to snowshoe hare virus of the California group in the snowshoe hare (Lepus americanus) and domestic animal populations of Prince Edward Island.

This study, the first of arbovirus activity in Prince Edward Island, has shown antibodies to the snowshoe hare strain of the California encephalitis group virus to be present in sera of wild and domestic animals; 15.35% of snowshoe hare, 20% of equine. and 2.5% of bovine sera were positive for hemagglutination inhibition antibody, confirmed by virus neutralization procedures.

Animals↗
PubMed1980

Virus isolations from mosquitoes in southern Ontario, 1976 and 1977.

Following the 1975 epidemic of St. Louis encephalitis (SLE) in Ontario, programs were instituted to monitor virus activity in mosquito populations during 1976 and 1977. Mosquitoes were trapped with CDC light traps and CO2 cone traps, pooled by species, and tested for virus by intracerebral inoculation of suckling mice. In 1976, 51 175 mosquitoes were tested. SLE virus was isolated from two mixed pools of Culex pipiens--C. restuans mosquitoes. Five isolations of California serogroup viruses were made. Three of these were trivittatus virus, which has not been demonstrated previously in Canada, and the other two were snowshoe have virus. Other viruses isolated in 1976 were a virus antigenically identical to the virus of infectious bursal disease of chickens and 34 Flanders viruses. In 1977, 34 428 mosquitoes were tested. Flanders virus was isolated most frequently, from pools of mixed C. pipiens--C. restuans mosquitoes. The only other isolate was a Bunyamwera group virus, Cache Valley virus. This virus has not been reported previously in Ontario.

Aedes↗
PubMed1980

Antibodies to snowshoe hare virus of the California group in the horse population in Nova Scotia.

A large number of North American equine samples were tested for the California group of arboviruses (CAL). Of 861 equine sera tested by hemagglutination inhibition using the snowshoe hare virus as an antigen, 106 (12.3%) were positive. Neutralization tests confirmed antibodies to this virus in 72 of the positive sera. This study provides evidence of CAL activity in the domestic animal population of Nova Scotia.

Animals↗
PubMed1978

California encephalitis virus activity in mosquitoes and horses in southern Ontario, 1975.

A study was undertaken in 1975 to determine California encephalitis virus activity in southern Ontario. Three thousand and sixty-one mosquitoes, primarily Aedes species, were divided into 104 pools and inoculated into suckling mice. Isolates of snowshoe hare virus were obtained from one pool each of Aedes fitchii and A. triseriatus mosquitoes collected in the Guelph area. Serological testing of horse sera revealed extensive virus activity in southern Ontario and indicated that horses may serve as excellent monitors for California encephalitis virus.

Aedes↗
PubMed1978

Aedes albopictus cells release a goose red blood cell agglutinin.

The presence of a goose red blood cell (RBC) agglutinin (HA) in the culture medium of apparently uninfected Aedes albopictus cells raised the possibility of contamination by an arbovirus. The HA sedimented in sucrose gradients between 18S and 28S and had a buoyant density in sucrose of 1,23 g/cm3. The HA adsorbed to concanavalin A-Sepharose and could be eluted with alpha-methyl-D-mannoside. The apparent molecular weights of the eluted glycoproteins were estimated by PAGE to range from 17,000 to 45,000. Treatment of culture medium from A.albopictus cells with excess goose RBC removed both HA activity and a proportion of the proteins of molecular weight 25,000--35,000. The HA also bound to human group 'O' RBC, It was not possible to inhibit hemagglutination with a variety of anti-arbovirus antisera. These data do not support the hypothesis that the HA is associated with an inapparent arbovirus infection of A.albopictus cells.

Aedes↗