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Between 1984 and 1987, antibodies to toxoplasmosis in dogs in the southern part of the Czech Republic were monitored. The dogs were German shepherds, reared and used by the border police in the line of their duty. Antibodies were ascertained by the Sabin-Feldman dye test (DT) at a titre of 4 or higher, and by the complement fixation test (CFT) at a titre of 10 or higher. Dogs from 21 kennels were...