Significance of isolated positive IgM serologic results by enzyme immunoassay for coccidioidomycosis

Janis E. Blair, Jeremiah T. Currier

Research output: Contribution to journalReview articlepeer-review

35 Scopus citations


Serologic testing is important for diagnosis of coccidioidomycosis. Many methods are available for diagnostic testing. Enzyme immunoassay (EIA) can be performed quickly and locally but has the potential for false-positive results in patients manifesting a positive EIA for immunoglobulin M (IgM) antibodies and a negative EIA for immunoglobulin G (IgG). We retrospectively reviewed the charts of 405 patients with coccidioidal serologic testing performed between 1999 and 2003. Of 706 EIAs, 37 (5%) produced test results for 28 patients that showed isolated IgM positivity. Among these 28 patients, 24 (86%) had positive serologic findings by other methods (complement fixation or immunodiffusion or both), and 7 (25%) had positive microbiologic or histopathologic findings. All 4 (14%) patients without other positive serologic results had diagnostic tests with positive microbiologic or histopathologic results. No false-positive IgM assays were observed. We conclude that the false-positive rate of the EIA IgM is low, and that an isolated positive EIA IgM should prompt further follow-up and diagnostic testing.

Original languageEnglish (US)
Pages (from-to)77-82
Number of pages6
Issue number2
StatePublished - Aug 2008


  • Coccidioides
  • False-positive reactions
  • Immunoenzyme techniques
  • Predictive value of tests

ASJC Scopus subject areas

  • Microbiology
  • Applied Microbiology and Biotechnology
  • Agronomy and Crop Science
  • veterinary (miscalleneous)


Dive into the research topics of 'Significance of isolated positive IgM serologic results by enzyme immunoassay for coccidioidomycosis'. Together they form a unique fingerprint.

Cite this