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Sensitivity and specificity of any skin test to evaluate the risk of a second dose reaction. Forrest plot of the sensitivity and specificity for the combined analysis of skin testing to polyethylene glycol, polysorbate, or either mRNA COVID‐19 vaccine in predicting the risk of a 2nd dose immediate allergic reaction to a mRNA COVID‐19 vaccine. M, Moderna; PEG, polyethylene glycol; PB, Pfizer‐BioNTech; PS, polysorbate.
