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Biomedical subjects

T J Wiktor

Publications and source records attributed to T J Wiktor.

At least 73 records · Page 4Linked to original sources
PubMed1972

Antibody response in vitro to an animal virus: production of rabies virus neutralizing antibodies by mouse cells in culture.

Rabies virus neutralizing antibodies were produced in vitro by the exposure of mouse spleen cells to live and inactivated rabies virus suspensions and to sheep erythrocytes coated with rabies virus. These antibodies did not neutralize two other rhabdoviruses: Kern Canyon and vesicular stomatitis viruses, and were precipitable by treatment with an antiserum to mouse IgG. Removal of "glass-adhering" cells from mouse spleen cell suspensions abolished the antibody response, which could be restored by the addition of mouse peritoneal exudate cells, rich in macrophages.

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PubMed1972

Immunogenicity of rabies virus inactivated by -propiolactone, acetylethyleneimine, and ionizing irradiation.

Ionizing radiation, beta-propiolactone, and acetylethyleneimine were compared for their ability as virus-inactivating agents for the preparation of rabies vaccine. Each agent reduced viral infectivity exponentially; ionizing radiation also destroyed viral hemagglutinin. The vaccine prepared by ionizing radiation was equal or superior to that prepared by beta-propiolactone in its ability to protect mice from rabies infection. The acetylethyleneimine-treated vaccine was a less potent immunogen.

Acetates↗
PubMed1972

Recovery of protective activity in rabies virus vaccines concentrated and purified by four different methods.

Rabies vaccines concentrated by ultrafiltration, zinc acetate precipitation, ammonium sulfate precipitation, or aluminum phosphate gel adsorption were compared with respect to recovery of protective activity and purity, as measured by protective activity per mg of protein. Vaccine obtained by ammonium sulfate precipitation had a better recovery rate and a higher purity than those prepared by the other methods. Potent vaccines were also obtained by the zinc acetate precipitation and aluminum phosphate gel adsorption methods, whereas ultrafiltration was the least satisfactory method from the standpoint of vaccine purity. Chromatography of virus concentrated by ultrafiltration on a cellulose ion exchange column reduced the level of nonviral proteins. The protective activity data obtained for the vaccines examined in these experiments were found to correlate with the vaccine's complement fixation titer per mg of protein.

Acetates↗
PubMed1972

Chronic rabies virus infection of cell cultures.

Exposure of both mammalian and reptilian cells in tissue culture to different strains of fixed rabies virus resulted in a carrier type of infection. No cytopathic effect was observed in either type of culture; infected cultures could be maintained by cell transfer for unlimited numbers of passages. A consistent pattern of cyclically rising and falling levels of viral infection was observed by fluorescent-antibody staining techniques and by titration of released infectious virus. Resistance to super-infection by vesicular stomatis virus and the production of an interferon-like substance by infected cells indicated that the maintenance of a carrier type of infection may be interferon-mediated. The degree of susceptibility of rabies-infected cells to immunolysis by antirabies antibody in the presence of complement was found to be correlated with the amount of virus maturation occurring by budding through the cell membrane and not with the presence of immunofluorescent antigen in the cytoplasm of infected cells.

Animals↗
PubMed1971

Effective protection of monkeys against death from street virus by post-exposure administration of tissue-culture rabies vaccine.

Three series of experiments on rabies vaccines were carried out on rhesus monkeys using suckling-mouse-brain vaccine, rabbit-brain vaccine, duck-embryo vaccine, and purified, concentrated tissue-culture vaccine. The latter was prepared in a human diploid cell strain and inactivated with beta-propiolactone, and consisted of tissue-culture fluid concentrated 200-fold with a final infectivity titre of 10(9.8) plaque-forming units per ml before inactivation. In the first two series of experiments, several vaccines were tested for relative immunogenicity on a pre-exposure basis. In the third series, a successful model was developed in which a single inoculation of the tissue-culture vaccine administered after exposure to rabies virus, with or without accompanying standard doses of antirabies serum, was evaluated as a method of prevention. A single dose of the tissue-culture vaccine protected 7 out of 8 monkeys from death by street virus. Homologous or heterologous antirabies serum alone gave poor results. The results indicate great promise for prophylaxis in man with one dose, or perhaps a few doses, of highly concentrated, purified tissue-culture vaccine.

Animals↗
PubMed1971

Inhibitory effect of passive antibody on active immunity induced against rabies by vaccination.

The administration of rabies-immune serum in addition to regular vaccination has been recommended as routine treatment in man after severe exposure to rabies virus. The inhibitory effect of passive antibody on active immunity induced against rabies by vaccination was investigated in rabbits. It was demonstrated that a dose of rabies-immune serum could completely block the neutralizing antibody response engendered by a very potent rabies vaccine. The inhibitory effect could be partially overcome if the number of vaccine doses was increased, if vaccination was started 15 days after serum administration, or if immune serum was given 12-24 hours after vaccination. Even under these circumstances, the antibody level was lower than that observed after administration of vaccine alone. Both 19S and 7S antibody exerted similar effects.

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