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Cell Wall Components and Antigenic Structure
On the basis of direct immunofluorescence and slide aggluti-nation tests, a total of 15 serogroups (1–15) of L. pneumophila have been identified. Of these, three serogroups (1, 4, and 6) are primarily associated with human disease.
Nearly, 80% of the cases of legionellosis disease caused by L. pneumophila are believed due to serogroup 1. L. pneumophila possesses both flagellar and somatic antigens.
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