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. 1986 Jan;23(1):92–99. doi: 10.1128/jcm.23.1.92-99.1986

Immunologic response of patients with legionellosis against major protein-containing antigens of Legionella pneumophila serogroup 1 as shown by immunoblot analysis.

J S Sampson, B B Plikaytis, H W Wilkinson
PMCID: PMC268578  PMID: 3517046

Abstract

Major protein-containing antigens of Legionella pneumophila serogroup 1 were were identified by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunoblot analysis with rabbit antisera to 14 different Legionella species or serogroups. Fourteen bands were observed in immunoelectropherograms of whole-cell, sonicated cell, and heated cell preparations, seven of which appeared in the supernatant fluid from the heated cells and three of which were shown in an outer membrane fraction. Immunoblots of whole-cell antigen preparations of 14 Legionella species or serogroups revealed seven major Legionella proteins: antigens with molecular weights of 58,000, 79,000, and 154,000 were present in all Legionella sp. strains, antigens with molecular weights of 44,000 and 97,000 occurred in multiple species, and antigens with molecular weights of 14,000 and 25,000 were present only in L. pneumophila strains. All sera from 15 patients with culture-confirmed L. pneumophila serogroup 1 disease and 14 of 18 (78%) sera from serologically diagnosed patients reacted with the 58-kilodalton (kDa) common antigen. In contrast, less than one-half of the sera reacted with the L. pneumophila-specific proteins (14 and 25 kDa). Absorption of sera with Escherichia coli cells had no effect on their reactivity with the 58-kDa antigen, whereas absorption with L. pneumophila serogroup 1 cells removed reactivity. These data suggest that the 58-kDa antigen may prove useful in serodiagnostic tests for legionellosis.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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