The effect of rifampicin and doxycycline on spontaneous and zymosan-induced chemiluminescence of polymorphonuclear leukocytes was studied on guinea pigs. The cells were incubated in the presence of the antibiotics, washed and stimulated by zymosan. Under such conditions rifampicin in therapeutic doses of 0.1 to 10 micrograms/kg and doxycycline in a dose of 100 micrograms/kg potentiated the leukocyte chemiluminescence. Investigation of the antibiotics effect on the cells without washing failed because of the direct interference of rifampicin and doxycycline with the cell-independent stage of the chemiluminescent reaction.
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