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           Search results for: Cryptosporidium parvum antibody, Monoclonal Antibodies, Host Mouse, Isotype IgG3   

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#8286458   1994/02/18 Save this To Up

Detection of Neospora caninum in tissue sections using a murine monoclonal antibody.

A murine monoclonal antibody (MAb 6G7), isotype IgG2a, produced against tachyzoites of Neospora caninum (isolate NC-1) reacted specifically with tachyzoites of N. caninum in an indirect immunofluorescent antibody test. MAb 6G7 did not react with tachyzoites of Toxoplasma gondii, sporozoites of Isospora suis, Eimeria bovis, or E. tenella, or merozoites of E. bovis in the indirect immunofluorescent antibody test. MAb 6G7 reacted positively with both tachyzoites and bradyzoites of N. caninum in an avidin-biotin peroxidase complex immunohistochemical test on formalin-fixed paraffin-embedded tissues. No reaction was observed with the following: tachyzoites and bradyzoites of T. gondii, T. gondii-like parasites, or Hammondia hammondi; bradyzoites of Frenkelia microti; schizonts and merozoites of Sarcocystis-like organisms; schizonts, sarcocysts, and oocysts/sporocysts of S. cruzi; schizonts and merozoites of S. canis; schizonts of S. hirsuta, S. tenella, and S. capracanis; merozoites of S. neurona and S. neurona-like organisms, E. bovis, or Haemoproteus sp.; bradyzoites and merozoites of S. montanaensis; bradyzoites of S. odocoileocanis, S. cruzi, and S. tenella; meronts, sexual stages, and caryocysts of Caryospora sp. and C. bigenetica; micromerozoites, macromerozoites, and schizonts of Hepatozoon canis; sporozoites, sexual stages, and oocysts of Cryptosporidium parvum and C. baileyi; trophozoites of Monocystis lumbrici, Tritrichomonas foetus, and Balantidium coli; tissue cysts and bradyzoites of Besnoitia sp. and B. jellisoni; amastigotes of Leishmania sp.; and trophic theronts of Ichthyopthirius multifilis. MAb 6G7 reacted with tachyzoites and bradyzoites of N. caninum in natural and experimental infections in dogs, cattle, mice, rats, sheep, and goats, indicating that host origin of the tissues did not affect the performance of the test.

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#8335387   1993/08/26 Save this To Up

Gamma interferon functions in resistance to Cryptosporidium parvum infection in severe combined immunodeficient mice.

Severe combined immunodeficient (SCID) adult mice are relatively resistant to Cryptosporidium parvum infection, even though they are deficient in both T- and B-cell function. The requirement for gamma interferon (IFN-gamma) in this resistance was examined by treatment of these mice with monoclonal antibody to IFN-gamma. SCID mice injected intraperitoneally with monoclonal anti-IFN-gamma 4 h before and three times weekly after challenge with C. parvum had heavy intestinal infections 3 weeks postchallenge. SCID mice similarly injected with irrelevant antibody were not infected. Furthermore, SCID mice receiving a single injection of anti-IFN-gamma either 2 h before or 18 h after challenge were also susceptible to infection. Although IFN-gamma was not detected in SCID mouse intestinal samples, it was found in the supernatant of SCID mouse splenocyte cultures after stimulation with C. parvum antigens. On the other hand, SCID mice receiving multiple injections of antibodies against tumor necrosis factor remained resistant to infection. These data indicate that the resistance of SCID mice to C. parvum infection is IFN-gamma dependent, whereas tumor necrosis factor appears not to play a significant role.

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