Helicobacter Pylori Infection in Infants and Toddlers in South America: Concordance Between [13C]urea Breath Test and Monoclonal H. Pylori Stool Antigen Test

Overview

Journal J Clin Microbiol

Specialty Microbiology

Date 2013 Sep 6

PMID 24006009

Citations 14

Authors

Dulciene Maria Magalhaes Queiroz

Mayuko Saito

Gifone Aguiar Rocha

Andreia Maria Camargos Rocha

Fabricio Freire Melo

William Checkley

Lucia Libanez Bessa C Braga

Igor Simoes Silva

Robert H Gilman

Jean E Crabtree

Affiliations

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Abstract

Accurate noninvasive tests for diagnosing Helicobacter pylori infection in very young children are strongly required. We investigated the agreement between the [(13)C]urea breath test ([(13)C]UBT) and a monoclonal ELISA (HpSA) for detection of H. pylori antigen in stool. From October 2007 to July 2011, we enrolled 414 infants (123 from Brazil and 291 from Peru) of ages 6 to 30 months. Breath and stool samples were obtained at intervals of at least 3 months from Brazilian (n = 415) and Peruvian (n = 908) infants. [(13)C]UBT and stool test results concurred with each other in 1,255 (94.86%) cases (kappa coefficient = 0.90; 95% confidence interval [CI] = 0.87 to 0.92). In the H. pylori-positive group, delta-over-baseline (DOB) and optical density (OD) values were positively correlated (r = 0.62; P < 0.001). The positivity of the tests was higher (P < 0.001; odds ratio [OR] = 6.01; 95% CI = 4.50 to 8.04) in Peru (546/878; 62.2%) than in Brazil (81/377; 21.5%) and increased with increasing age in Brazil (P = 0.02), whereas in Peru it decreased with increasing age (P < 0.001). The disagreement between the test results was associated with birth in Brazil and female gender but not with age and diarrhea. Our results suggest that both [(13)C]UBT and the stool monoclonal test are reliable for diagnosing H. pylori infection in very young children, which will facilitate robust epidemiological studies in infants and toddlers.

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