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Infect. Immun., 07 1997, 2725-2731, Vol 65, No. 7
RA Van Andel, RR Hook Jr, CL Franklin, CL Besch-Williford, N van Rooijen and LK Riley
Clostridium piliforme infection (Tyzzer's disease) induces enterohepatic
disease in many domestic and laboratory animals. Murine susceptibility to
Tyzzer's disease varies with host strain, age, and immune status However,
little is known about the role of the immune system in control of this
disease. To investigate the role of host immunity in Tyzzer's disease, mice
were depleted of either neutrophils, natural killer cells, or macrophages
by antibody administration or chemotherapy. After depletion, DBA/2 mice,
which are naturally susceptible to C. piliforme, or naturally resistant
C57BL/6 mice were inoculated intravenously with C. piliforme. Animals were
euthanized 3 days postinoculation and evaluated for gross and histologic
lesions and hepatic bacterial load. In juvenile DBA/2 or C57BL/6 mice,
depletion of either neutrophils or natural killer cells increased severity
of disease. In adult mice, depletion of natural killer cells significantly
increased severity of Tyzzer's disease in the resistant (C57BL/6) but not
in the susceptible (DBA/2) strain. Macrophage depletion did not alter the
course of infection in either mouse strain. These studies indicate an
important role for neutrophils and natural killer cells in the pathogenesis
of murine Tyzzer's disease. The role of macrophages in murine C. piliforme
infection will require further evaluation.
Copyright © 1997, American Society for Microbiology
Effects of neutrophil, natural killer cell, and macrophage depletion on murine Clostridium piliforme infection
Department of Veterinary Pathobiology, College of Veterinary Medicine, University of Missouri, Columbia 65211, USA.
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