Tag: zoology

Type IV hypersensitivity is cell-mediated by T-lymphocytes and does not involve antibodies, unlike Types I, II, and III.

The T helper cells also known as CD$ _4^+$ release cytokines and trigger the activity of other immune cells.

In Type IV hypersensitivity, sensitized T-helper cells (specifically Th1 cells) are the first to arrive at the site and release lymphokines to recruit other cells.

The skin prick test works by introducing an allergen into the skin, which triggers an inflammatory reaction (wheal and flare) mediated by IgE on mast cells.

Bronchial asthma is a classic allergic disease characterized by airway inflammation and hypersensitivity to triggers.

The skin prick test is a standard diagnostic procedure used to identify specific allergens causing IgE-mediated allergic reactions.

Anaphylaxis is a severe, life-threatening systemic allergic reaction that affects the entire body. Symptoms often include gastrointestinal distress like nausea, vomiting, and abdominal pain, along with respiratory and cardiovascular symptoms.

Anaphylaxis, also known as anaphylactic shock is a serious allergic reaction that is rapid in onset and may cause death. It typically causes an itchy rash, throat or tongue swelling, shortness of breath, vomiting, lightheadedness, and low blood pressure. Common causes include insect bites and stings, foods, and medications.  The mechanism involves the release of mediators from certain types of white blood cells triggered by either immunologic or non-immunologic mechanisms.

Histamine causes a skin response. If you dont react to histamine, your allergy skin test may not reveal the allergy.

Allergy blood tests, such as those measuring IgE levels, are used to assess the concentration of specific antibodies, identify potential cross-reactivity between allergens, and monitor the development or progression of allergic diseases.