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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. Bone marrow depression
Polio (Oral)×Bone marrow depression

Bone marrow depression Reports for Polio (Oral)

#438 most reported symptom for this vaccine

4
Reports
2
Deaths
2
Hospitalizations
50
Mortality Rate
%
50
Hosp. Rate
%

Bone marrow depression and Polio (Oral)

Bone marrow depression has been reported 4 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 (50.00%) and 2 involved hospitalization (50.0%).

Bone marrow depression is the #438 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 4 reports of Bone marrow depression after Polio (Oral) vaccination may seem alarming, but context is critical.

The 50.00% 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 Bone marrow depression occurred after vaccination, not that the vaccine caused it.
•Background rates: Bone marrow depression 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

Leukoplakia oral4 reportsOrchitis4 reportsCerebellar syndrome4 reportsSubcutaneous nodule4 reports

Quick Facts

Reports:4
Deaths:2
Hospitalizations:2
% of Vaccine:0.0%
Rank:#438 of 558

Related Pages

Polio (Oral) OverviewBone marrow depression (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.