ObjectiveSome individuals (vaccinees) experience pain related adverse events following vaccinations. The majority of these pain related vaccination reactogenicity adverse events resolve within days. Rare adverse events like Bell's palsy and Guillain-Barré syndrome (GBS) have been associated with some vaccines. Herein, multiple working hypotheses are examined in the context of available characteristics of vaccinees and onset of these pain related adverse events post vaccination.
MethodsThe Vaccine Adverse Event Reporting System (VAERS) database was datamined for pain associated vaccine adverse events data by vaccine, age, gender, dose, and onset post vaccination. Results for vaccines with the highest number of pain related adverse events were compared.
ResultsFor the pain related adverse events examined, the highest number of adverse events are reported within 1 day, roughly half this number the second day, and roughly a quarter this number by the third day. The day of onset for these pain related adverse events approximates a power of two decay pattern for the rst three days. This same pattern is observed for all of the vaccines with the highest number of pain related adverse events. The consistency of these day of onset frequency patterns of examined adverse events following vaccinations for multiple unrelated vaccines enables the exclusion of speci c vaccine components and excipients as speci cally causative entities.
ConclusionThe observed onset occurrences of examined pain associated adverse events are consistent with likely etiology relationship with innate immune responses to vaccinations for multiple vaccines including SARS-CoV-2 COVID-19, in uenza, and additional vaccines. Innate immune responses may be contributing to the initial etiology of Bell's palsy and GBS post SARS-CoV-2 mRNA and adenoviral vaccinations.