Yersinia Antibody

Overview

Yersinia antibodies are immunoglobulins produced by the host immune system in response to infection with Yersinia species, most commonly Yersinia enterocolitica and Yersinia pseudotuberculosis. They reflect prior or ongoing exposure to these enteropathogens, which can cause gastroenteritis, mesenteric lymphadenitis, and extra‑intestinal manifestations. High titers, particularly of IgA and IgG, may indicate recent or chronic infection and have been linked to reactive arthritis and certain autoimmune phenomena, whereas negative results reduce the likelihood of recent infection but do not fully exclude it. Clinically, Yersinia antibody testing is useful when stool cultures are negative or no longer possible, and in evaluating suspected post‑infectious or extra‑intestinal complications.

Clinical Use Cases

  • Supportive diagnosis of Yersinia enterocolitica or Yersinia pseudotuberculosis infection when culture or PCR are negative or late.
  • Evaluation of patients with prolonged abdominal pain, mesenteric adenitis, or pseudoappendicitis.
  • Assessment of suspected post‑infectious reactive arthritis or sacroiliitis.
  • Investigation of possible association with autoimmune thyroid disease or other autoimmune conditions in selected research settings.
  • Epidemiologic and seroprevalence studies of Yersinia exposure.

Specimen Types

  • Serum.
  • Plasma (less commonly, depending on assay validation).

Measurement Methods

  • Enzyme-linked immunosorbent assay (ELISA) for Yersinia-specific IgG, IgM, and IgA.
  • Indirect immunofluorescence assays (IFA).
  • Western blot or immunoblot for confirmation and antigen pattern analysis.
  • Agglutination or complement fixation tests (historical, largely replaced by ELISA).

Test Preparation and Influencing Factors

  • No fasting required.
  • Timing of sampling is important: early infection may show isolated IgM or low titers; later infection shows rising IgG/IgA.
  • Prior antibiotic therapy may reduce bacterial detection but not antibody response, increasing reliance on serology.
  • Cross-reactivity with other Gram-negative bacteria can cause false-positive results in some assays.
  • Immunosuppression (e.g., corticosteroids, biologics, HIV) may blunt antibody responses and yield false-negative or low-titer results.
  • Paired sera (acute and convalescent, 2–4 weeks apart) improve diagnostic accuracy by documenting rising titers.

Synonyms

  • Yersinia enterocolitica antibody.
  • Yersinia pseudotuberculosis antibody.
  • Anti-Yersinia IgG/IgM/IgA.
  • Yersinia serology.

Further Reading