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Data source: VAERS (Vaccine Adverse Event Reporting System)

Data through 2026 · Updated quarterly

Built by TheDataProject.ai · © 2026 VaccineWatch

Important: VAERS accepts reports of adverse events following vaccination. For any given report, there is no certainty that the reported event was caused by the vaccine. Reports may contain information that is incomplete, inaccurate, coincidental, or unverifiable. Most reports to VAERS are voluntary, which means they are subject to biases. This data cannot be used to determine if vaccines cause or contribute to adverse events.

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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.

  1. Home
  2. Vaccines
  3. Mumps (Mumpsvax II)
  4. Pyrexia
Mumps (Mumpsvax II)×Pyrexia

Pyrexia Reports for Mumps (Mumpsvax II)

#1 most reported symptom for this vaccine

37
Reports
6
Deaths
6
Hospitalizations
16.22
Mortality Rate
%
16.2
Hosp. Rate
%

Pyrexia and Mumps (Mumpsvax II)

Pyrexia has been reported 37 times in association with Mumps (Mumpsvax II) vaccination in VAERS. This represents 21.6% of all 171 reports for this vaccine.

Among these reports, 6 mentioned death (16.22%) and 6 involved hospitalization (16.2%).

Pyrexia is the #1 most frequently reported symptom for Mumps (Mumpsvax II) out of 66 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.

What This Means

Seeing 37 reports of Pyrexia after Mumps (Mumpsvax II) vaccination may seem alarming, but context is critical.

The 16.22% mortality rate among these reports is elevated, but this reflects the severity of the condition itself rather than vaccine causation.

Important Context

•Association, not causation: These reports show Pyrexia occurred after vaccination, not that the vaccine caused it.
•Background rates: Pyrexia may occur naturally at baseline rates in the population, unrelated to vaccination.
•Anyone can report: VAERS accepts reports from anyone — patients, parents, healthcare providers — without requiring medical verification.
•Denominator missing: VAERS counts reports, not rates per dose. Without knowing how many doses were given, raw counts can be misleading. Learn more →

Similarly Ranked Symptoms

Headache15 reportsDrug ineffective13 reports

Quick Facts

Reports:37
Deaths:6
Hospitalizations:6
% of Vaccine:21.6%
Rank:#1 of 66

Related Pages

Mumps (Mumpsvax II) OverviewPyrexia (All Vaccines)Why Raw Numbers MisleadTop Symptoms Analysis

Data Source

This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.