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Related Concept Videos

Allergic Reactions02:06

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Allergic Reactions: Anaphylaxis01:30

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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 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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Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial...
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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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Allergic reactions related to drugs are hypersensitivity responses driven by the immune system and bear no connection to the drug's therapeutic action. While drugs in isolation do not trigger an immune response, they can interact with endogenous proteins to form antigens. These antigens stimulate lymphocytes to produce antibodies. IgE-type antibodies attach themselves to mast cells. Upon subsequent exposure to the same stimulus, the antigen-antibody interaction is initiated, unleashing...
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Zebrafish Animal Model for the Study of Allergic Reactions in Response to Tick Saliva Biomolecules
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Environmental variables influencing tick anaphylaxis presentations: An observational study.

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Environmental factors influencing tick anaphylaxis (TA) in Australia are unclear. Bushfires may reduce TA cases, but weather

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Area of Science:

  • Environmental science
  • Public health
  • Epidemiology

Background:

  • Ixodes holocyclus ticks are common on Australia's east coast.
  • Tick anaphylaxis (TA) incidence is rising.
  • Environmental influences on TA are not well understood.

Purpose of the Study:

  • Correlate environmental variables with TA cases in New South Wales (NSW).
  • Predict tick seasons and identify high-risk areas.
  • Inform public health initiatives for tick awareness.

Main Methods:

  • Collected monthly data on temperature, rainfall, dewpoint, and fire extent.
  • Analyzed data from 278 TA patients (2005-2022) in NSW.
  • Used Pearson's correlation to compare environmental data with tick bite locations and dates.

Main Results:

  • Weak correlations found between TA cases and rainfall, temperature, and dewpoint in Greater Sydney.
  • Strong negative correlation between TA cases and percentage area burned in Greater Sydney (r = -0.94).
  • Similar weak correlations observed in Northern and Southern coastal NSW.

Conclusions:

  • Bushfires may decrease TA incidence by destroying tick habitats.
  • The impact of weather variables on TA remains inconclusive.
  • Further research is needed to understand tick ecosystems and improve public health strategies.