Evidence map›Paper›PMID 22422855›Full record

ArticleJournal of clinical microbiology2012

Validation of the MycAssay Pneumocystis kit for detection of Pneumocystis jirovecii in bronchoalveolar lavage specimens by comparison to a laboratory standard of direct immunofluorescence microscopy, real-time PCR, or conventional PCR.

Lisa R McTaggart, Nancy L Wengenack, Susan E Richardson

Open access · bronzeAbstract readValidation Study
In one paragraph

Article in Journal of clinical microbiology, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 18 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
18citing papers in PubMed, 1 pooled it
3.3field-weighted citation impact, top 8% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

18 citing papers in PubMed, 1 synthesis or guideline pooled it, 52 citations in OpenAlex.

  1. Pooled it
  2. Outcomes of concomitantAnnals of medicine · 2026
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  3. An overview of the laboratory diagnosis ofJournal of clinical microbiology · 2025
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  7. Clinical microbiology reviews · 2024
    Review
  8. Article
  9. Is It Possible to DifferentiateJournal of fungi (Basel, Switzerland) · 2021
    Article
  10. Review
  11. Comparative Evaluation Between the RealStarAnnals of laboratory medicine · 2019
    Article
  12. Review
  13. [Rapid diagnostic test for respiratory infections].Enfermedades infecciosas y microbiologia clinica · 2017
    Review
  14. Article
  15. Pneumocystis jirovecii Pneumonia in Rheumatoid Arthritis Patients: Risks and Prophylaxis Recommendations.Clinical medicine insights. Circulatory, respiratory and pulmonary medicine · 2015
    Review
  16. Article
  17. Review
  18. Development and validation of a Pneumocystis jirovecii real-time polymerase chain reaction assay for diagnosis of Pneumocystis pneumonia.The Canadian journal of infectious diseases & medical microbiology = Journal canadien des maladies infectieuses et de la microbiologie medicale
    Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors at 3 institutions in 2 countries.

Lisa R McTaggartPublic Health Laboratory, Public Health Ontario, Toronto, ON, Canada. lisa.mctaggart@oahpp.ca
Nancy L Wengenack
Susan E Richardson
Hospital for Sick Children · CAMayo Clinic · USPublic Health Ontario · CA

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Pneumocystis jirovecii pneumonia is a significant cause of morbidity and mortality in AIDS patients as well as those with non-HIV immunosuppressive diseases. To aid diagnosis, the commercial MycAssay Pneumocystis real-time PCR assay (Myconostica, Ltd., Manchester, United Kingdom) targeting the mitochondrial ribosomal large subunit (mtLSU) has been developed to detect P. jirovecii in bronchoalveolar lavage (BAL) specimens. Here, we validated this assay against a laboratory standard of direct immunofluorescence microscopy, a cdc2 real-time PCR assay, or conventional PCR and sequencing of mtLSU. While more sensitive than any of these three assays analyzed individually, the MycAssay Pneumocystis assay demonstrated 100% sensitivity, 100% specificity, a 100% negative predictive value, and a 100% positive predictive value for detecting the presence of P. jirovecii in BAL specimens compared to the laboratory standard. Of note, two samples with positive cycle threshold (C(T)) values according to the MycAssay Pneumocystis assay lacked exponential amplification curves and thus were deemed negative. Also negative according to the laboratory standard, these samples highlight the importance of examining the amplification curves, in addition to noting the C(T) values, when interpreting positive results. Comparison of the MycAssay Pneumocystis assay to a laboratory standard establishes this assay to be a highly sensitive and specific method for the detection of P. jirovecii in bronchoalveolar lavage specimens. The approach may also be useful for the clinical laboratory validation of other sensitive real-time PCR assays.

Indexed as

Bronchoalveolar Lavage FluidFluorescent Antibody Technique, DirectHumansMicrobiological TechniquesMolecular Diagnostic TechniquesMycologyPneumocystis cariniiPneumonia, PneumocystisPredictive Value of TestsReal-Time Polymerase Chain ReactionSensitivity and SpecificityUnited Kingdom

Identifiers

PMID22422855
PMCPMC3372158
OpenAlexW2086081694

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.