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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.

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  2. Vaccines
  3. Mumps (Mumpsvax II)
  4. Mumps antibody test negative
Mumps (Mumpsvax II)×Mumps antibody test negative

Mumps antibody test negative Reports for Mumps (Mumpsvax II)

#5 most reported symptom for this vaccine

12
Reports
2
Deaths
3
Hospitalizations
16.67
Mortality Rate
%
25
Hosp. Rate
%

Mumps antibody test negative and Mumps (Mumpsvax II)

Mumps antibody test negative has been reported 12 times in association with Mumps (Mumpsvax II) vaccination in VAERS. This represents 7.0% of all 171 reports for this vaccine.

Among these reports, 2 mentioned death (16.67%) and 3 involved hospitalization (25.0%).

Mumps antibody test negative is the #5 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 12 reports of Mumps antibody test negative after Mumps (Mumpsvax II) vaccination may seem alarming, but context is critical.

The 16.67% 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 Mumps antibody test negative occurred after vaccination, not that the vaccine caused it.
•Background rates: Mumps antibody test negative 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

Drug ineffective13 reportsPain12 reportsNausea11 reportsRash11 reports

Quick Facts

Reports:12
Deaths:2
Hospitalizations:3
% of Vaccine:7.0%
Rank:#5 of 66

Related Pages

Mumps (Mumpsvax II) OverviewMumps antibody test negative (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.