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An Unexpected Post-Egg-Free Influenza Vaccine Granulomatous Reaction
Casey E Engel1, Kiley K Fagan2, Susan B Dorsey3
1Virginia Tech Carilion School of Medicine, Roanoke, VA.
The American Journal of Dermatopathology
|June 6, 2024
Summary
A rare case of granulomatous dermatitis developed after an egg-free flu vaccine. This unusual vaccine reaction, presenting as a skin plaque, has not been previously reported.
Area of Science:
- Dermatology
- Immunology
- Vaccinology
Background:
- Hypersensitivity reactions to vaccines are common, often linked to specific components like egg proteins.
- Granulomas from vaccination are typically associated with aluminum adjuvants, not usually seen in egg-free influenza vaccines.
Observation:
- A 53-year-old woman developed a pruritic plaque on her arm after receiving an egg-free influenza vaccine.
- Biopsy revealed dermal "naked" granulomas, characteristic of sarcoidosis, but imaging ruled out systemic sarcoidosis.
Findings:
- The patient's skin lesion showed granulomatous dermatitis.
- No foreign material or organisms were identified within the granulomatous infiltrate.
- The reaction occurred despite the absence of egg protein and aluminum adjuvant.
Implications:
- This case highlights an unusual and previously unreported granulomatous reaction to an egg-free influenza vaccine.
- It expands the understanding of potential vaccine-induced dermatological adverse events.
- Further research may be needed to elucidate the mechanisms behind such rare vaccine hypersensitivities.
