Di. Bounous et al., NON-ASSOCIATION OF MACROPHAGE PHAGOCYTOSIS AND OXIDANT STIMULATION WITH COMPLEMENT RESISTANCE AND COLICIN V-PRODUCTION BY AVIAN ESCHERICHIA-COLI, Avian diseases, 38(1), 1994, pp. 135-140
Avian isolates of Escherichia coli were classified as virulent based o
n their isolation from chickens with natural cases of colisepticemia,
production of colicin V, and complement resistance. A second group of
isolates was designated as avirulent based on their isolation from hea
lthy chickens, their inability to produce colicin, and their classific
ation as sensitive or intermediate to the action of complement. In vit
ro assays of phagocytosis and oxidant production were performed in an
attempt to correlate these activities with the ability of each group o
f bacteria to escape the specific host defense mechanisms of phagocyto
sis and killing. Although oxidant production regressed with significan
t linearity on percent phagocytosis, neither group (virulent or avirul
ent) differed in ability to stimulate peritoneal macrophage phagocytic
and oxidant activity when opsonized with normal chicken serum. These
results differ from those in mammalian species.