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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. Hepatitis B (Engerix-B)
  4. Pyrexia
Hepatitis B (Engerix-B)×Pyrexia

Pyrexia Reports for Hepatitis B (Engerix-B)

#1 most reported symptom for this vaccine

11,112
Reports
149
Deaths
1,530
Hospitalizations
1.34
Mortality Rate
%
13.8
Hosp. Rate
%

Pyrexia and Hepatitis B (Engerix-B)

Pyrexia has been reported 11,112 times in association with Hepatitis B (Engerix-B) vaccination in VAERS. This represents 15.2% of all 73,280 reports for this vaccine.

Among these reports, 149 mentioned death (1.34%) and 1,530 involved hospitalization (13.8%).

Pyrexia is the #1 most frequently reported symptom for Hepatitis B (Engerix-B) out of 2382 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 11,112 reports of Pyrexia after Hepatitis B (Engerix-B) vaccination may seem alarming, but context is critical.

The mortality rate of 1.34% warrants monitoring, though VAERS deaths represent temporal associations, not confirmed causal links.

Important Context

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

No adverse event6,485 reportsRash5,834 reports

Quick Facts

Reports:11,112
Deaths:149
Hospitalizations:1,530
% of Vaccine:15.2%
Rank:#1 of 2382

Related Pages

Hepatitis B (Engerix-B) OverviewPyrexia (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.