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Transparent access to VAERS data for informed decision-making. We present the data as-is, with appropriate context and disclaimers.

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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. Polio (Oral)
  4. Brain neoplasm
Polio (Oral)×Brain neoplasm

Brain neoplasm Reports for Polio (Oral)

#387 most reported symptom for this vaccine

6
Reports
2
Deaths
0
Hospitalizations
33.33
Mortality Rate
%
0
Hosp. Rate
%

Brain neoplasm and Polio (Oral)

Brain neoplasm has been reported 6 times in association with Polio (Oral) vaccination in VAERS. This represents 0.0% of all 27,089 reports for this vaccine.

Among these reports, 2 mentioned death (33.33%) and 0 involved hospitalization (0.0%).

Brain neoplasm is the #387 most frequently reported symptom for Polio (Oral) out of 558 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 6 reports of Brain neoplasm after Polio (Oral) vaccination may seem alarming, but context is critical.

The 33.33% 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 Brain neoplasm occurred after vaccination, not that the vaccine caused it.
•Background rates: Brain neoplasm 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

Apraxia6 reportsLoss of consciousness6 reportsHigh-pitched crying6 reportsCerebral palsy6 reports

Quick Facts

Reports:6
Deaths:2
Hospitalizations:0
% of Vaccine:0.0%
Rank:#387 of 558

Related Pages

Polio (Oral) OverviewBrain neoplasm (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.