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Related Concept Videos

Allergic Reactions02:06

Allergic Reactions

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Asthma is a chronic inflammatory disorder of the airways characterized by variable airflow obstruction and heightened bronchial responsiveness to a wide range of triggers. The underlying inflammation leads to airway swelling, mucus hypersecretion, and smooth muscle constriction, all of which narrow the airway lumen and impede airflow. Clinically, asthma presents with recurrent episodes of wheezing, shortness of breath, chest tightness, and coughing, symptoms that typically vary in intensity and...
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Anaphylaxis is a severe, life-threatening hypersensitivity reaction mediated by Immunoglobulin E (IgE) antibodies. When IgE binds to allergens, it triggers the release of mediators– histamine, leukotrienes, and prostaglandins from mast cells and basophils. These mediators cause vasodilation, edema, and inflammation, leading to various symptoms.The primary allergens causing anaphylaxis include food items (e.g., peanuts, shellfish), drugs (e.g., penicillin, asparaginase, corticotropin,...
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Asthma-I: Introduction01:29

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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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Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
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Related Experiment Video

Updated: Apr 17, 2026

A Component-resolved Diagnostic Approach for a Study on Grass Pollen Allergens in Chinese Southerners with Allergic Rhinitis and/or Asthma
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Differences in grass pollen allergen exposure across Australia.

Paul J Beggs1, Constance H Katelaris, Danielle Medek

  • 1Department of Environment and Geography, Macquarie University, New South Wales.

Australian and New Zealand Journal of Public Health
|February 5, 2015
PubMed
Summary

Australian grass pollen seasons show significant spatial and temporal variability, challenging the utility of static pollen calendars. Improved national monitoring is crucial for managing allergic respiratory diseases.

Keywords:
allergenallergic asthmaallergic rhinitispollenseason

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Area of Science:

  • Environmental Science
  • Allergology
  • Public Health

Background:

  • Allergic rhinitis and asthma are significant public health issues in Australia, with pollen as a major aeroallergen trigger.
  • Outdoor aeroallergens, particularly pollen, are key contributors to allergic respiratory diseases.

Purpose of the Study:

  • To assess the current state of Australian pollen data from a national and international perspective.
  • To analyze spatial and temporal variations in atmospheric grass pollen concentrations across Australia.

Main Methods:

  • Examined atmospheric grass pollen concentrations from 1995 to 2013 in major Australian cities.
  • Determined the 'clinical' grass pollen season and peak pollen counts for each location.

Main Results:

  • Revealed striking spatial and temporal variability in Australian grass pollen seasons.
  • Highlighted significant deficiencies and limitations in existing Australian pollen monitoring and data.

Conclusions:

  • Static pollen calendars are of limited use and can be misleading due to observed variability.
  • Establishing a national pollen monitoring network is essential for advancing clinical and public health management of allergic diseases in Australia.