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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. Smallpox (Acam2000)
  4. Pleural effusion
Smallpox (Acam2000)×Pleural effusion

Pleural effusion Reports for Smallpox (Acam2000)

#367 most reported symptom for this vaccine

20
Reports
3
Deaths
13
Hospitalizations
15
Mortality Rate
%
65
Hosp. Rate
%

Pleural effusion and Smallpox (Acam2000)

Pleural effusion has been reported 20 times in association with Smallpox (Acam2000) vaccination in VAERS. This represents 0.2% of all 8,768 reports for this vaccine.

Among these reports, 3 mentioned death (15.00%) and 13 involved hospitalization (65.0%).

Pleural effusion is the #367 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 20 reports of Pleural effusion after Smallpox (Acam2000) vaccination may seem alarming, but context is critical.

The 15.00% 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 Pleural effusion occurred after vaccination, not that the vaccine caused it.
•Background rates: Pleural effusion 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

Skin irritation20 reportsSkin nodule20 reportsRhinitis20 reportsCardiac disorder20 reports

Quick Facts

Reports:20
Deaths:3
Hospitalizations:13
% of Vaccine:0.2%
Rank:#367 of 1393

Related Pages

Smallpox (Acam2000) OverviewPleural effusion (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.