Important: VAERS reports alone cannot determine if a vaccine caused an adverse event. Reports may contain incomplete, inaccurate, or unverified information. Correlation does not equal causation.
#476 most reported symptom for this vaccine
Mast cell activation syndrome has been reported 17 times in association with HPV (Gardasil 9) vaccination in VAERS. This represents 0.1% of all 26,909 reports for this vaccine.
Among these reports, 0 mentioned death (0.00%) and 4 involved hospitalization (23.5%).
Mast cell activation syndrome is the #476 most frequently reported symptom for HPV (Gardasil 9) out of 1593 total symptoms.
Disclaimer: VAERS reports describe events that occurred after vaccination but do not establish that the vaccine caused the event. Many reported symptoms may be coincidental or related to underlying conditions.
Seeing 17 reports of Mast cell activation syndrome after HPV (Gardasil 9) vaccination may seem alarming, but context is critical.
The mortality rate among these reports is very low at 0.00%, suggesting most cases are non-fatal.
This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.