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Veterinary Pathology, Vol 36, Issue 4 321-327, Copyright © 1999 by American College of Veterinary Pathologists

ARTICLES

Pathological and immunological findings of athymic nude and congenic wild type BALB/c mice experimentally infected with Neospora caninum

T. Shibahara, T. Kokuho, M. Eto, M. Haritani, T. Hamaoka, K. Shimura, K. Nakamura, Y. Yokomizo and I. Yamane
National Institute of Animal Health, Ministry of Agriculture, Forestry and Fisheries, Tsukuba-shi, Ibaraki, Japan. tshiba@affrc.go.jp

Neospora is a cyst-forming coccidian parasite that causes abortions and neuromuscular disorders in a wide variety of mammals. Japanese bovine isolate JPA1 was inoculated intraperitoneally into BALB/c nu/ nu (athymic nude) and BALB/c (congenic wild type) female mice to examine the distribution of parasites and resistance mechanisms to Neospora infection. All the athymic nude mice died within 28 days after intraperitoneal injection of 2 x 10(5) JPA1 tachyzoites, whereas all the congenic wild type mice survived without exhibiting any clinical signs. Tachyzoites were identified in the uterus and pancreas and later spread to many other organs. Most tachyzoites identified in the necrotic foci were localized in the epithelium of the venules and capillaries. Nude mice developed high level of serum interferon-gamma and interleukin-6 as infection proceeded. Inflammatory response to Neospora infection might be mediated by Th1-type dependent cellular immunity.


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Inclusion of CpG Adjuvant with Plasmid DNA Coding for NcGRA7 Improves Protection against Congenital Neosporosis
Infect. Immun., March 1, 2004; 72(3): 1817 - 1819.
[Abstract] [Full Text] [PDF]


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