Abstract
Crithidia harmosa and Crithidia fasciculata were compared immunologically by the indirect fluorescent antibody (FA) method and by agglutination. The FA technic yielded more specific results with cellular-debris than with whole-cell antigens. The immune sera collected from chickens 9 days after the last inoculations with whole-cell antigens had higher homologous titers than those collected after 4 days. Major antigenic differences between the 2 species were revealed by both methods. The electrophoretic patterns of C. harmosa and C. fasciculata obtained by polyacrylamide gel slab electrophoresis differed in the numbers and relative mobilities of their component bands.
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