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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 oedema
Polio (Oral)×Brain oedema

Brain oedema Reports for Polio (Oral)

#119 most reported symptom for this vaccine

66
Reports
51
Deaths
37
Hospitalizations
77.27
Mortality Rate
%
56.1
Hosp. Rate
%

Brain oedema and Polio (Oral)

Brain oedema has been reported 66 times in association with Polio (Oral) vaccination in VAERS. This represents 0.2% of all 27,089 reports for this vaccine.

Among these reports, 51 mentioned death (77.27%) and 37 involved hospitalization (56.1%).

Brain oedema is the #119 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 66 reports of Brain oedema after Polio (Oral) vaccination may seem alarming, but context is critical.

The 77.27% 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 oedema occurred after vaccination, not that the vaccine caused it.
•Background rates: Brain oedema 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

Bradycardia67 reportsDrug toxicity67 reportsOsteoarthritis66 reportsIntracranial pressure increased66 reports

Quick Facts

Reports:66
Deaths:51
Hospitalizations:37
% of Vaccine:0.2%
Rank:#119 of 558

Related Pages

Polio (Oral) OverviewBrain oedema (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.