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Asthma-I: Introduction01:29

Asthma-I: Introduction

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Asthma is a chronic respiratory ailment that requires careful management due to its varying symptoms and influencing factors. It is characterized by airway inflammation, bronchial hyperresponsiveness, and reversible airflow obstruction, leading to symptoms like wheezing, shortness of breath, chest tightness, and coughing. The symptom frequency and intensity may vary considerably over time. It is also linked to immune system responses to allergens and irritants, highlighting the complex...
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Asthma-II: Pathophysiology and Classification01:26

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Asthma is a prevalent chronic respiratory condition marked by inflammation and hyperresponsiveness of the airways. Its pathophysiology involves complex interactions among inflammatory pathways, immune responses, and neural mechanisms.
Additionally, environmental and genetic factors play crucial roles in determining an individual's susceptibility to asthma and the severity of their condition.
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Asthma: Pathogenesis and Management01:20

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Asthma is a chronic pulmonary condition involving inflammation of the airways, hyper-reactivity, and reversible obstruction of the airways. This condition can significantly impact a person's quality of life, making breathing difficult and leading to distressing symptoms.
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Asthma-III: Symptoms and Complications01:24

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Asthma, a common chronic respiratory condition, is classified considering the frequency and severity of symptoms alongside lung function impairment. Understanding this classification is essential for appropriate treatment and management. Here's a detailed look at the classification of asthma and its clinical features and complications:
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Asthma-IV: Diagnostic and Management01:30

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The diagnosis and management of asthma are comprehensive, encompassing clinical assessments, lung function tests, and pharmacological interventions. Here's an overview:
Clinical Assessment for Asthma:
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Related Experiment Video

Updated: Feb 27, 2026

Noninvasive Sampling of Mucosal Lining Fluid for the Quantification of In Vivo Upper Airway Immune-mediator Levels
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Helicobacter, Hygiene, Atopy, and Asthma.

Muhammad Miftahussurur1,2,3, Iswan A Nusi3, David Y Graham1

  • 1Gastroenterology and Hepatology Section, Department of Medicine, Baylor College of MedicineHouston, TX, United States.

Frontiers in Microbiology
|June 24, 2017
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Summary

Helicobacter pylori infection, often acquired in childhood, is linked to hygiene. While some studies suggest it protects against allergies, evidence indicates it

Keywords:
Helicobacter pyloriallergyasthmaatopyhygiene hypothesis

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Area of Science:

  • Immunology
  • Microbiology
  • Epidemiology

Background:

  • The hygiene hypothesis suggests reduced early-life microbial exposure increases allergy and asthma risk.
  • Helicobacter pylori infection, common in childhood, is associated with poor hygiene.
  • H. pylori's link to atopy, allergy, and asthma is debated: protective factor or hygiene biomarker?

Purpose of the Study:

  • To review evidence on the association between H. pylori infection and atopy, allergy, and asthma.
  • To evaluate whether H. pylori infection has a protective role against these conditions.
  • To determine if H. pylori serves as a biomarker for hygiene and subsequent disease risk.

Main Methods:

  • Systematic review of surveys, cohort studies, and meta-analyses.
  • Analysis of studies specifically testing the protective hypothesis of H. pylori.
  • Examination of the correlation between H. pylori prevalence, hygiene levels, and allergic diseases.

Main Results:

  • Survey and cohort study results on H. pylori and allergies are inconsistent.
  • Meta-analyses reveal a weak, inverse correlation between H. pylori infection and atopy/allergy.
  • Studies in low-prevalence, poor-hygiene populations did not support a protective effect of H. pylori against asthma.

Conclusions:

  • H. pylori infection is primarily a biomarker for poor childhood hygiene, not a protective factor.
  • While environmental factors influence atopy, allergy, and asthma, H. pylori's role is linked to hygiene status.
  • H. pylori itself or its antigens do not appear to offer specific prevention for allergic diseases.