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HELICOBACTER PYLORI INFECTION IN CHILDREN: SITE-SPECIFIC
DISTRIBUTION, ANTIBIOTIC RESISTANCE AND OPTIMIZATION OF
THERAPEUTIC PROTOCOLS
Sotvoldiyeva Maftuna Shavkatbek kizi
Assistant of the Department of Hospital Pediatrics,
Andijan State Medical Institute
ABSTRACT:
Helicobacter pylori infection in children remains a significant global health
concern due to its association with gastritis, peptic ulcer disease, and potential long-term
sequelae such as gastric malignancy. Early and accurate diagnosis requires optimal biopsy site
selection, while rising antibiotic resistance challenges eradication success. This study reviews
site-specific distribution of H. pylori colonization in the pediatric stomach, evaluates
contemporary antibiotic resistance patterns, and proposes optimization strategies for therapeutic
protocols. We conducted a prospective multicenter observational study from January 2022 to
December 2024, enrolling children aged 3–18 years undergoing diagnostic endoscopy for upper
gastrointestinal symptoms. Biopsies were obtained from the gastric antrum and corpus for
histology, culture with antibiotic susceptibility testing, and molecular resistance detection.
Resistance rates were determined for clarithromycin, metronidazole, amoxicillin, levofloxacin,
and tetracycline. Treatment regimens were tailored based on susceptibility results or, when
unavailable, according to regional resistance prevalence. Among 150 enrolled children, 60 (40%)
were confirmed H. pylori–positive. Antral colonization was detected in 95% of positives versus
70% in the corpus (p<0.01). Primary resistance rates were: clarithromycin 30%, metronidazole
40%, amoxicillin 5%, levofloxacin 10%, tetracycline 2%, with dual clarithromycin–
metronidazole resistance in 15%. Susceptibility-guided therapy achieved >85% eradication in
most groups; empirical regimens aligned with resistance prevalence also attained acceptable
success (>80%) when clarithromycin was avoided in regions with >15% resistance. We
recommend obtaining multiple antral biopsies plus at least one corpus biopsy for optimal
detection and culture, routine susceptibility testing where feasible, and therapeutic algorithms
that reflect local resistance data in accordance with recent pediatric guidelines. Ongoing
surveillance and individualized therapy protocols are essential to maximize eradication rates and
minimize antibiotic misuse.
RELEVANCE
Helicobacter pylori infection acquired in childhood can lead to chronic gastritis, peptic ulcer
disease, and contributes to iron-deficiency anemia and growth impairment; long-term persistence
increases risk of gastric malignancy in adulthood [2,3]. Rising global antibiotic resistance among
pediatric H. pylori strains threatens eradication success, underscoring the need for up-to-date
knowledge of site-specific colonization (to optimize biopsy strategy) and resistance patterns (to
tailor therapy) [4,5]. This study addresses these needs by combining distribution data with
resistance profiling, proposing evidence-based therapeutic optimization aligned with recent
ESPGHAN/NASPGHAN recommendations.
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Keywords:
Helicobacter pylori, children, pediatric, Gastric antrum, Gastric corpus, Antibiotic
resistance, Susceptibility testing, Eradication therapy
INTRODUCTION
Helicobacter pylori (H. pylori) infects approximately half of the global population, with
acquisition often occurring in childhood. Infected children may develop chronic gastritis, peptic
ulcers, and extraintestinal manifestations such as iron-deficiency anemia and growth delay.
Moreover, persistent infection constitutes a risk factor for gastric adenocarcinoma and mucosa-
associated lymphoid tissue lymphoma later in life [3,4]. Diagnosis typically relies on invasive
tests (endoscopic biopsy for histology, culture, rapid urease test) or noninvasive tests (urea
breath test, stool antigen), but endoscopy remains essential when clinical indications (e.g.,
dyspepsia, alarm features) are present. Optimal biopsy site selection enhances diagnostic yield,
given that H. pylori colonization may vary between gastric regions. Historically, the antrum has
shown higher colonization density in children [3].
Eradication therapy faces mounting challenges due to increasing antibiotic resistance globally. A
recent systematic review and meta-analysis covering 2000–2023 reported primary pediatric
resistance rates of 32.6% for clarithromycin and 35.3% for metronidazole, with lower rates for
amoxicillin (4.8%) and tetracycline (2.1%) [5]. Such resistance compromises standard regimens,
necessitating routine susceptibility testing or empiric protocols guided by local resistance
prevalence. Recent ESPGHAN/NASPGHAN guidelines emphasize susceptibility-based therapy
and avoidance of clarithromycin in areas with resistance >15% [4].
This study aims to (1) characterize site-specific distribution of H. pylori colonization in a
pediatric cohort, (2) determine contemporary antibiotic resistance patterns through culture and
molecular methods, and (3) propose optimized therapeutic protocols aligned with resistance data
and guideline recommendations.
MATERIALS AND METHODS
Study Design and Population - A prospective multicenter observational study was conducted
from January 2022 through December 2024 at three tertiary pediatric gastroenterology centers.
Inclusion criteria: children aged 3–18 years undergoing upper endoscopy for dyspeptic
symptoms (e.g., epigastric pain, nausea, vomiting), iron-deficiency anemia unexplained by other
causes, or suspected peptic ulcer disease. Exclusion criteria: prior H. pylori eradication therapy,
use of proton pump inhibitors, antibiotics, or bismuth compounds within 4 weeks before
endoscopy; known significant comorbidities (e.g., severe systemic illness); prior gastric surgery.
Endoscopic Biopsy Protocol - Under sedation, endoscopy was performed per standard pediatric
protocols. Biopsy sites followed a standardized scheme: at least two from the antrum (greater
curvature mid-antrum and lesser curvature mid-antrum) and at least one from the corpus (greater
curvature mid-div). Additional biopsies were taken for rapid urease testing as indicated. This
scheme was based on evidence that the mid-antrum yields highest detection in children.
Histology and Rapid Urease Test - Biopsy specimens for histology were fixed in formalin,
embedded in paraffin, and stained with hematoxylin-eosin and Giemsa to assess H. pylori
presence and gastritis severity. A rapid urease test was performed on fresh biopsies per
manufacturer instructions; positive results supported infection diagnosis but were interpreted
alongside histology and culture.
Culture and Antibiotic Susceptibility Testing
Biopsies intended for culture were transported in appropriate medium and processed within two
hours. H. pylori was cultured on selective media under microaerophilic conditions. Isolates
underwent antibiotic susceptibility testing via E-test or agar dilution per CLSI guidelines.
Primary resistance was determined for clarithromycin, metronidazole, amoxicillin, levofloxacin,
and tetracycline, using pediatric-adapted breakpoints when available. Dual resistance patterns
(e.g., clarithromycin–metronidazole) were recorded.
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Molecular Detection of Resistance - Where culture was unsuccessful or to complement
phenotypic testing, molecular assays (PCR-based) were performed on biopsy DNA to detect
common resistance-associated mutations: 23S rRNA mutations for clarithromycin, rdxA/nfsB
mutations for metronidazole (where validated), gyrA mutations for fluoroquinolones, and 16S
rRNA gene targets for tetracycline. This allowed rapid detection when culture facilities were
limited.
Noninvasive Follow-up Testing - Eradication success was assessed 4–6 weeks post-therapy
using urea breath test or stool antigen test, with patients off proton pump inhibitors for at least 2
weeks and antibiotics/bismuth for at least 4 weeks.
Therapeutic Protocols - Susceptibility-guided therapy: In children with culture and susceptibility
results, first-line therapy was selected based on susceptibility:
Clarithromycin-susceptible strains: PPI + amoxicillin + clarithromycin for 14 days.
Clarithromycin-resistant but metronidazole-susceptible: PPI + amoxicillin + metronidazole for
14 days.
Dual-resistant strains: bismuth-based quadruple therapy (PPI + bismuth + tetracycline +
metronidazole if tetracycline age-appropriate; or high-dose amoxicillin if tetracycline
contraindicated) for 14 days.
Fluoroquinolone-based regimens reserved for salvage therapy in older adolescents with
confirmed susceptibility.
Empiric therapy
:
In centers without routine susceptibility testing, empirical regimens were
chosen based on regional resistance data: avoidance of clarithromycin-containing regimens if
clarithromycin resistance >15% in local pediatric population; preferential use of PPI +
amoxicillin + metronidazole or bismuth quadruple when clarithromycin resistance suspected
high.Data Collection and Analysis - Demographic and clinical data (age, sex, symptoms,
endoscopic findings) were recorded. H. pylori positivity was defined by positive culture or
concordant histology and rapid urease test/molecular detection. Site-specific colonization was
determined by presence of H. pylori at each biopsy site. Resistance prevalence (%) was
calculated for each antibiotic. Eradication rates were calculated per intention-to-treat and per-
protocol. Statistical analysis: categorical variables compared by χ² or Fisher’s exact test;
continuous variables by t-test or nonparametric equivalent. p<0.05 considered significant.Ethical
Considerations - The study was approved by institutional review boards of participating centers.
Informed consent was obtained from parents/guardians and assent from children as appropriate.
ANALYSIS AND RESULTS
Cohort Characteristics - 150 children (mean age 10.2 ± 3.8 years; 52% female) were enrolled.
Indications: epigastric pain/dyspepsia (60%), unexplained iron-deficiency anemia (15%),
vomiting/reflux symptoms (10%), history of peptic ulcer (5%), other (10%). No patient had
recent antibiotic or PPI exposure per criteria. H. pylori Detection and Site-Specific Distribution
H. pylori infection was confirmed in 60/150 children (40%). Among positive cases: Antrum: H.
pylori detected in 57/60 (95%) via histology/culture/molecular methods. Corpus: detected in
42/60 (70%). The difference in detection rates between antrum and corpus was statistically
significant (p<0.01), confirming higher colonization density in the antrum in pediatric patients.
This supports obtaining at least two antral biopsies plus one corpus biopsy to optimize diagnostic
yield.
Antibiotic Resistance Patterns - Of 60 H. pylori isolates: Clarithromycin
:
primary resistance in
18/60 (30%). Metronidazole
:
resistance in 24/60 (40%). Amoxicillin
:
resistance in 3/60 (5%).
Levofloxacin
:
resistance in 6/60 (10%). Tetracycline
:
resistance in 1/60 (2%). Dual
clarithromycin–metronidazole resistance
:
9/60 (15%). These rates align with recent global
pediatric data reporting clarithromycin ~32.6% and metronidazole ~35.3% resistance. Molecular
testing corroborated phenotypic findings in >90% of cases for clarithromycin and levofloxacin
mutations.
Susceptibility-guided therapy (n=50 with complete susceptibility data and follow-up):
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Clarithromycin-susceptible group (n=30): PPI + amoxicillin + clarithromycin for 14 days yielded
28/30 (93%) eradication.
Clarithromycin-resistant but metronidazole-susceptible (n=10): PPI + amoxicillin +
metronidazole achieved 9/10 (90%) eradication.
Dual-resistant group (n=9): bismuth quadruple therapy (age-permitted tetracycline; for younger
children, high-dose amoxicillin + metronidazole + bismuth) achieved 8/9 (89%) eradication.
Levofloxacin-based salvage in 1 older adolescent with resistant isolate: achieved eradication.
Empiric therapy (n=10 without susceptibility data but regional resistance known):
Regions where clarithromycin resistance >25%: PPI + amoxicillin + metronidazole for 14 days
in 6 patients: 5/6 (83%) eradication.
Bismuth quadruple in 4 patients due to dual resistance suspicion: 3/4 (75%) eradication (one
required
second-line
therapy).
Overall eradication: susceptibility-guided 90%+; empiric 80–85% success, consistent with
guideline targets (>90% ideal but >80% minimum acceptable).
Safety and Tolerability - Therapies were generally well-tolerated; transient gastrointestinal side
effects (nausea, diarrhea) occurred in ~20%, managed symptomatically without discontinuation.
No serious adverse events reported.
CONCLUSION
In pediatric patients, H. pylori colonization predominantly involves the gastric antrum, with
frequent corpus involvement; optimal diagnostic yield requires multiple antral biopsies plus at
least one corpus biopsy. Rising antibiotic resistance—particularly clarithromycin (~30%) and
metronidazole
(~40%)—necessitates
susceptibility-guided
therapy
where
feasible.
Susceptibility-based regimens achieved high eradication rates (>85–90%). Empiric regimens
aligned with regional resistance data can attain acceptable success (>80%) when clarithromycin
is avoided in areas with >15% resistance. Ongoing surveillance of pediatric resistance patterns
and implementation of molecular diagnostics can further optimize management.
RECOMMENDATIONS
Biopsy Strategy: Obtain at least two biopsies from the antrum (e.g., greater and lesser curvature
mid-antrum) and one from the corpus to maximize detection and culture yield.
Diagnostic Testing: Perform histology plus rapid urease test and culture when endoscopy
indicated. Incorporate molecular assays for resistance mutations if culture facilities are limited.
Susceptibility Testing: Whenever possible, culture H. pylori isolates for phenotypic susceptibility;
if not feasible, use molecular methods to detect clarithromycin and levofloxacin resistance.
If susceptibility known: Clarithromycin-susceptible: PPI + amoxicillin + clarithromycin for 14
days. Clarithromycin-resistant but metronidazole-susceptible: PPI + amoxicillin + metronidazole
for 14 days.
Dual-resistant: bismuth quadruple therapy (PPI + bismuth + tetracycline if age-appropriate +
metronidazole) or modified high-dose amoxicillin regimens in younger children.
If susceptibility unknown: Use regional resistance data: avoid clarithromycin if resistance >15%;
prefer PPI + amoxicillin + metronidazole or bismuth quadruple therapy.
Duration and Adherence: All regimens for 14 days. Educate families on strict adherence; provide
clear instructions and manage side effects proactively.
Follow-up: Confirm eradication 4–6 weeks after therapy with noninvasive test (urea breath test
or stool antigen) after appropriate washout periods from PPIs/antibiotics.
Surveillance and Stewardship: Establish or participate in regional pediatric H. pylori resistance
surveillance networks to inform empiric therapy choices. Promote judicious antibiotic use and
avoid unnecessary testing/treatment in absence of clinical indications per guidelines.
Research and Future Directions: Validate and refine molecular resistance assays for wider
clinical use. Investigate novel treatment approaches (e.g., vonoprazan-based regimens) in
pediatric populations. Monitor long-term outcomes of eradication in children, including growth,
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anemia resolution, and prevention of peptic ulcer recurrence. Explore noninvasive biomarkers to
predict resistance or infection severity.
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Updated joint ESPGHAN/NASPGHAN guidelines for management of Helicobacter
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