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- W1498969845 abstract "Abstract : Rickettsia prowazeki were assessed for their in vitro susceptibility to phagocytosis by rabbit polymorphonuclear leukocytes (PMN). ATP labeling was used to quantitatively determine phagocytosis and adsorption. Rickettsiae were less susceptible to phagocytosis then were Escherichia coli and Neisseria gonorrhoeae. Although rickettsiae were similar to E. coli in susceptibility to superoxide and activated halide, few phagocytized rickettsiae were inactivated 45 min after being ingested by PMN and some rickettsiae were observed free in the PMN cytoplasm. At low rickettsia: PMN multiplicities, phagocytosis increased as a linear function of time, but at high multiplicities (MOI=50) rickettsiae were phagocytized during only the first 10 min of incubation. PMN were damaged in the presence of high rickettsial multiplicities such that they released lactate dehydrogenase into the medium and lost the ability to phagocytize both rickettsiae and E. coli. This rickettsial leukotoxic activity was associated with phospholipase activity which was similar to the phospholipase activity associated with rickettsial hemolysis, and the amount of leukotoxic activity in a given rickettsial sample correlated with the relative hemolytic activity of that sample." @default.
- W1498969845 created "2016-06-24" @default.
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- W1498969845 date "1980-08-01" @default.
- W1498969845 modified "2023-09-28" @default.
- W1498969845 title "Biochemical Basis of Virulence in Epidemic Typhus" @default.
- W1498969845 doi "https://doi.org/10.21236/ada134377" @default.
- W1498969845 hasPublicationYear "1980" @default.
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