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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. Smallpox (Acam2000)
  4. Back pain
Smallpox (Acam2000)×Back pain

Back pain Reports for Smallpox (Acam2000)

#65 most reported symptom for this vaccine

150
Reports
3
Deaths
46
Hospitalizations
2
Mortality Rate
%
30.7
Hosp. Rate
%

Back pain and Smallpox (Acam2000)

Back pain has been reported 150 times in association with Smallpox (Acam2000) vaccination in VAERS. This represents 1.7% of all 8,768 reports for this vaccine.

Among these reports, 3 mentioned death (2.00%) and 46 involved hospitalization (30.7%).

Back pain is the #65 most frequently reported symptom for Smallpox (Acam2000) out of 1393 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 150 reports of Back pain after Smallpox (Acam2000) vaccination may seem alarming, but context is critical.

The mortality rate of 2.00% warrants monitoring, though VAERS deaths represent temporal associations, not confirmed causal links.

Important Context

•Association, not causation: These reports show Back pain occurred after vaccination, not that the vaccine caused it.
•Background rates: Back pain 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

Rash generalised157 reportsDiarrhoea153 reportsRash macular145 reportsPolymerase chain reaction144 reports

Quick Facts

Reports:150
Deaths:3
Hospitalizations:46
% of Vaccine:1.7%
Rank:#65 of 1393

Related Pages

Smallpox (Acam2000) OverviewBack pain (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.