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Legionnaires' Disease
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Appendix I:A. Serogroups and Subtypes

Appendix I:A. Serogroups and Subtypes
Closely related microorganisms that share common, measurable surface components are said to belong to a serogroup. Each serogroup of L. pneumophila contains further subtypes that have different surface structures on the cell membrane and can be distinguished by special tests.
  • Evidence indicates that some L. pneumophila serogroups are more virulent than others.

  • L. pneumophila serogroup 1 is the most frequently identified form of the bacterium isolated from patients with Legionnaires' disease, although other serogroups and subtypes of the bacterium are frequently isolated from water sources.

  • Serogroups 4 and 6 are the second and third types most frequently linked with Legionnaires' disease.
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