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Helicobacter. 2020 Feb;25(1):e12671. doi: 10.1111/hel.12671. Epub 2019 Nov 20.

Performance of multiplex serology in discriminating active vs past Helicobacter pylori infection in a primarily African American population in the southeastern United States.

Author information

1
Cancer Control and Population Sciences Program, Duke Cancer Institute and Department of Population Health Sciences, Duke University, Durham, NC, USA.
2
Infection and Cancer Epidemiology, German Cancer Research Center, Heidelberg, Germany.
3
Division of Epidemiology, Vanderbilt University Medical Center, Nashville, TN, USA.
4
Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA.
5
Department of Epidemiology, University of North Carolina Gillings School for Global Public Health and the Lineberger Comprehensive Cancer Center, Chapel Hill, NC, USA.
6
Department of Biostatistics and Bioinformatics, Duke University, Durham, NC, USA.

Abstract

PURPOSE:

To feasibly analyze associations of Helicobacter pylori (H. pylori) with disease in large cohort studies, assays are needed to assess H. pylori prevalence in existing biospecimens. However, serology has traditionally been unable to distinguish active from past infection. We sought to determine the sensitivity of seropositivity to H. pylori proteins to detect active infection.

METHODS:

We measured antibody responses to 13 H. pylori proteins using multiplex serology in serum samples of a training (n = 78) and validation set (n = 49) collected concurrently from patients undergoing urea breath test (UBT). To determine sensitivity of seropositivity to H. pylori proteins for active infection, a cutoff was applied to achieve 90% specificity. Antibody levels were retested in a subset of participants (n = 16) 6 months after baseline.

RESULTS:

With a specificity of 91%, seropositivity to H. pylori proteins VacA, GroEl, HcpC, and HP1564 ascertained active infection from 100% to 75% sensitivity. Positivity to a combination of these proteins (≥2 out of the 4) resulted in specificity of 90% and sensitivity of 100%. The validation set replicated results from the training set. Among those participants with successful H. pylori eradication after baseline, antibody levels decreased significantly for VacA, HcpC, and HP1564 when assessed 6 months later.

CONCLUSION:

Utilizing the cutoffs for seropositivity established through comparison with UBT, seropositivity to ≥2 of the H. pylori proteins VacA, GroEl, HcpC, and HP1564 determines active H. pylori infection at high specificity and sensitivity and may approximate the prevalence of active H. pylori infection in large cohorts.

KEYWORDS:

eradication; multiplex serology; urea breath test

PMID:
31746104
PMCID:
PMC6940508
[Available on 2021-02-01]
DOI:
10.1111/hel.12671

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