A type ____ allergic reaction is an inflammatory reaction secondary to T-lymphocytes and macrophages, such as a contact dermatitis from poison ivy, that may result from cross-contamination of topical ointments or crèmes.

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The type IV allergic reaction, also known as delayed hypersensitivity, is mediated by T-lymphocytes and macrophages and results in inflammation. This type of reaction can occur with exposure to certain substances, including poison ivy, and can also result from cross-contamination of topical products. Types I, II, and III allergic reactions involve different mechanisms and are not associated with contact dermatitis or delayed hypersensitivity.

A Type ____ Allergic Reaction Is an Inflammatory Reaction Secondary