Allergic Reactions

In 1906, “allergy” was first defined as an “altered reaction” to a substance, meaning a reaction that most people did not get. Later, four types of classical allergy were described with specific immune system involvements: Type I- Immediate, Type II-Cytotoxic, Type III- Immune Complex, and Type IV-Delayed. Although these four categories are still used today, … Continue reading

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