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J Clin Microbiol. 1987 April; 25(4): 594-596

Cross-reactions in Legionella antisera with Bordetella pertussis strains.

ABSTRACT

While preparing slide agglutination test antisera and immunofluorescence conjugates for the identification of Legionella species and serogroups, we found that several of the reagents cross-reacted with Bordetella pertussis strains. To determine the extent of this problem and to estimate the specificity of Legionella reagents, we tested slide agglutination test antisera against 22 species and 35 serogroups with 92 bacterial strains representing 19 genera. The only cross-reactions observed were with Legionella pneumophila serogroup 10, L. maceachernii, L. gormanii, and L. feeleii serogroup 1 antisera and 4 of 10 B. pertussis strains. Nineteen conjugates, previously available from the Centers for Disease Control but no longer distributed as reference reagents, were tested with the four cross-reactive B. pertussis strains. Two conjugates, L. micdadei and L. wadsworthii, stained three of the B. pertussis strains at a fluorescence intensity of greater than or equal to 3+. All cross-reactions were removed from the antisera and conjugates by absorption with the cross-reacting strain without diminishing the homologous reaction. Special emphasis should be placed on the identification and removal of cross-reactions in Legionella reagents with strains that have similar morphologic and growth characteristics.

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