Oral adverse events following COVID-19 and influenza vaccination in Australia.

Oral adverse events following COVID-19 and influenza vaccination in Australia.

Publication date: Aug 01, 2023

Vaccine hesitancy, spurred by misinterpretation of Adverse Events (AEs), threatens public health. Despite sporadic reports of oral AEs post-COVID-19 vaccination, systematic analysis is scarce. This study evaluates these AEs using the Australian Database of Adverse Event Notifications (DAEN). A secondary analysis of DAEN data was conducted, with the analysis period commencing from the start of the COVID-19 vaccination rollout in February 2021 and the inception of the influenza vaccine database in 1971, both through until December 2022. The focus of the analysis was on oral AEs related to COVID-19 and influenza vaccines. Reports were extracted according to a predefined schema and then stratified by vaccine type, sex, and age. Oral paresthesia was the most common oral AE after COVID-19 vaccination (75. 28 per 10,000 reports), followed by dysgeusia (73. 96), swollen tongue (51. 55), lip swelling (49. 43), taste disorder (27. 32), ageusia (25. 85), dry mouth (24. 75), mouth ulceration (18. 97), oral hypoaesthesia (15. 60), and oral herpes (12. 74). While COVID-19 and influenza vaccines shared most oral AEs, taste-related AEs, dry mouth, and oral herpes were significantly more common after COVID-19 vaccination. mRNA vaccines yielded more oral AEs than other types. Females had higher oral AE incidence. Most oral AEs did not differ significantly between COVID-19 and influenza vaccination. However, specific oral AEs, particularly taste-related, dry mouth, and oral herpes, were more prevalent after COVID-19 vaccination compared with seasonal influenza, especially in females and mRNA vaccine recipients.

Concepts Keywords
Australia COVID-19 vaccines
Influenza herpes zoster
Misinterpretation pharmacovigilance
Paresthesia taste disorders


Type Source Name
disease MESH COVID-19
disease MESH influenza
disease VO vaccination
disease VO vaccine
disease VO adverse event
disease VO influenza vaccines
disease MESH paresthesia
disease MESH taste disorder
disease VO mouth
disease VO Optaflu
disease MESH drug-related side effects and adverse reactions
disease MESH herpes zoster

Original Article

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