Abstract
This paper reports information on the levels of interferon (IFN) in the blood serum of dairy calves given 10(6) U of bacteria-derived bovine alpha I1 interferon per kg of body weight by intravenous (i.v.), intramuscular (i.m.), subcutaneous (s.c.), and intranasal (i.n.) routes. Highest levels (10,000 U/ml) in the vesicular stomatitis viral assay system were obtained after i.v. administration and occurred within 30 min of a dose; levels rapidly declined thereafter to a low of 200 to 300 U/ml by 24 h. Serum inhibitory activity against vesicular stomatitis virus in this range is sometimes found in normal dairy calves. Levels after i.m. and s.c. administration were similar: a plateau of 1,000 to 2,000 U/ml between 2 and 8 h after a treatment with a decline to 200 to 300 U/ml by 24 h. Serum IFN was not detected after i.n. dosing or in the control group given physiological buffered saline by the i.m. route. A transitory moderate febrile response, but no other clinical adverse effects, was noted after the first intramuscular dose of IFN, but not after subsequent i.m. doses. No clinical signs were noted after i.v., s.c., or i.n. dosing or in the control calves given physiological buffered saline intramuscularly. After i.v., s.c., and i.m. administration of IFN, leukopenia, neutropenia, and lymphocytopenia were observed; these were most prominent within the first 24 h after the initial dose of IFN.
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