‘COVID vaccine arm’
Delayed local reactions to the Moderna vaccine were also described in a report published online on May 12, 2021, in JAMA Dermatology, after the AAD meeting, in 16 patients referred to the Yale New Haven (Conn.) Hospital Dermatology service who experienced delayed localized cutaneous hypersensitivity reactions a median of 7 days after receiving the vaccine (range, 2-12 days), from Jan. 20 to Feb. 12, 2021. No such cases were reported in Pfizer vaccine recipients.
Of the 16 patients, whose median age was 38 years and who were mostly women, 15 developed the reaction after the first dose, described as “pruritic and variably painful erythematous reactions near the injection site,” which lasted a median of 5 days (range, 1-21 days). After the second dose, 12 of the 16 patients developed injection-site reactions (including one patient who had no reaction after dose 1), a median of 2 days after the vaccine was administered (range, 0-5 days). Histologic results of a biopsy in one patient with a reaction to the second dose “ demonstrated mild predominantly perivascular and focal interstitial mixed infiltrate with lymphocytes and eosinophils consistent with a dermal hypersensitivity reaction,” wrote Alicia J. Little, MD, PhD, of the department of dermatology, Yale University, New Haven, and coauthors.
Compared with immediate hypersensitivity reactions, occurring within 4 hours of vaccination, such as anaphylaxis and urticaria, they concluded that “these delayed localized hypersensitivity reactions are not a contraindication to subsequent vaccination,” and they proposed that they be named “COVID vaccine arm.”
Dr. Freeman reported no disclosures. Dr. Lipner also had no relevant disclosures. Dr. Little reported receiving a grant from the National Center for Advancing Translational Science and a Women’s Health Career Development Award from the Dermatology Foundation while the study was conducted; another author reported equity in Johnson & Johnson in his spouse’s retirement fund outside the submitted work.