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Updated: May 2, 2026

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Published on: April 2, 2013
Legionella and the enterobacterial common antigen.
This study investigated Legionella pneumophila for the enterobacterial common antigen (ECA). Researchers found no evidence of ECA in the examined strains, indicating no cross-reactivity with other antigens.
Area of Science:
- Microbiology
- Immunology
Background:
- Legionella pneumophila is a significant human pathogen.
- The enterobacterial common antigen (ECA) is found in many Gram-negative bacteria.
- Understanding antigen presence in L. pneumophila is crucial for diagnostics and therapeutics.
Purpose of the Study:
- To determine the presence of the enterobacterial common antigen (ECA) in Legionella pneumophila strains.
- To investigate potential cross-reactivity between ECA and other antigens in L. pneumophila.
Main Methods:
- In vitro hemagglutination assays were performed on L. pneumophila Philadelphia 1 and Knoxville 1.
- Dermal hypersensitivity reactions were assessed in guinea pigs inoculated with L. pneumophila antigens.
Main Results:
- No enterobacterial common antigen (ECA) was detected in either L. pneumophila Philadelphia 1 or Knoxville 1.
- No cross-reactivity was observed between ECA and the identified proteinaceous cross-reacting antigen.
Conclusions:
- The examined strains of Legionella pneumophila lack the enterobacterial common antigen (ECA).
- These findings suggest that ECA is not a reliable target for serological detection or immunotherapy in Legionella infections.
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