[Mumps vaccine virus transmission].

In this work we report the mumps vaccine virus shedding based on the laboratory confirmed cases of the mumps virus (MuV) infection. The likely epidemiological sources of the transmitted mumps virus were children who were recently vaccinated with the mumps vaccine containing Leningrad-Zagreb or Leningrad-3 MuV. The etiology of the described cases of the horizontal transmission of both mumps vaccine viruses was confirmed by PCR with the sequential restriction analysis.

[Comparative evaluation of two enzyme immunoassays for detection of immunoglobulin G antibodies to mumps virus].

Two enzyme immunoassays (ELISA) for mumps antibody detection using the Enzygnost (Germany) and Parotit-screen (Russia) were comparatively assayed using sera of randomly assigned 70 healthy young adult volunteers. The neutralization test (NT) was performed for all sera using mumps viruses (MVs) of the relevant strains Enders and Leningrad-3. The proportion of positive results was significantly higher with the Parotit-screen than with the Enzygnost (80% versus 52.

[Comparative evaluation of Leningrad-3 mumps vaccine virus neurovirulence in a neonatal rat model].

The neurovirulence and replication potential of several mumps virus strains, including Leningrad-3 mumps vaccine virus (FSUE SIC "Microgen", Russia) and wild type strains isolated in the Novosibirsk Region (Russia), were assessed in rat tests. The mean neurovirulence scores of the Leningrad-3 virus (< 4.0) were significantly lower than those of wild type strains (ranging from 6.

[Virus strain specific serum neutralizing antibodies in children and adolescents immunized with a Russian mumps vaccine].

Postvaccination immunity was studied in the children and teenagers without a history of clinical mumps infection, who had been immunized with the Leningrad-3 mumps vaccine. The level of specific lgG in ELISA and that and spectrum of their neutralizing activity against a vaccine strain and three heterologous mumps virus (MV) strains (genotypes A, C, and H) were measured. The investigation included 151 sera from the vaccinees aged 3 to 17 years, possessing the detectable specific IgG titers in ELISA and the detectable neutralizing titers against the vaccine strain.

[Functional state of specific immunity in children and teenagers vaccinated against mumps].

The functional state of immunity was evaluated from the avidity index (AI) of specific antibodies (IgG) and the level and spectrum of their neutralizing activity. The study recruited 200 subjects immunized with Russian vaccine against mumps according to the mandatory scheme. A group of vaccinees with a low AI of specific IgG was identified mainly among old children and teenagers.

[Comparative study of hemostasis and cytokine production in experimental Dengue virus infection].

Some parameters of hemostasis and cytokine production during the fatal and nonfatal course of experimental human versus murine infection caused by Dengue virus (DV) were studied. Its lethal dose administration induced a rapid development of anemia, thrombocytopenia and a change in packed cell volume. These changes were not so profound in the nonfatal group of infected mice.

[Immune response in vaccinated and non-vaccinated mice infected with tick-borne encephalitis virus].

The paper deals with an investigation of an immune response in BALB/c mice immunized with tick-borne encephalitis (TBE) vaccine and infected with TBE virus and in non-immunized mice. The parameters of specific humoral (IgG and IgM) and cellular (gamma-interferon (IFN) and cell proliferation) immunities and the activity of cytokines (necrosis tumor factor-alpha, interleukin (IL)-1beta, IL-2, IL-6, IL-10, and IL-12) were studied. There were significant differences in the specific and nonspecific immune response of immunized and non-immunized animals.

[An experimental study of possibility of treatment of hemorrhagic fever Marburg by Remicade].

The effect of Remicade, administered according to different schemes, produced on the course of experimental Marburg hemorrhagic fever was studied. When the drug was used from the first infection day, the treated animals died reliably earlier versus the controls (infected animals). A reliably lower concentration of TNF-alpha in blood serum (versus the controls) was registered on day 3.

[Activity of cytokines in immunization with a vaccine against experimental tick-borne encephalitis].

An experimental double immunization of BALB/c mice with a vaccine against tick-borne encephalitis was accompanied by the production of IL-1b, IL-2, IL-4, IL-6, IL-10, IL-12, TNFa and gamma-IFN in the blood serum of animals. After the first immunization of animals with the vaccine against tick-borne encephalitis, the activity of cytokine was indicative of an activation of macrophages as well as of an activation and differentiation of T- and B-lymphocytes. After the second immunization and unlike the first one, there were changes in the production only of IL-10, IL-12 and gamma-IFN, which can be indicative of a regulation of balance between Th1 and Th2.

[Cytokine production during experimental infection of mice with tick-borne encephalitis virus].

An experiment with BALB/c mice, infected with a lethal dosage of the virus of tick-borne encephalitis (TE), strain 205, was accompanied by pronounced growing concentrations of the IL-1 beta, IL-6, IL-10 and TNF alpha cytokines in the blood serum of animals. The maximum values of the above cytokines were determined at the infection terminal stage. A reliably less pronounced growth of concentrations of IL-1 beta, TNF alpha and IL-10 was found in animals infected with a non-lethal TE dosage.

[Production of immune mediators, induced by Lassa virus, in a human mononuclear cell culture].

Infection of human mononuclear cells with Lassa virus leads to production of inflammatory cytokines (tumor necrosis factor and interleukin-1). These cytokines cause expression of adhesion receptors ICAM-1 and VCAM-1 by human endothelial cells. Mitogen-induced cell proliferation was not suppressed 1 h after infection of human mononuclear cells with Lassa virus in a dose of 0.