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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 A + B (Twinrix)
  4. Hepatitis A antibody negative
Hepatitis A + B (Twinrix)×Hepatitis A antibody negative

Hepatitis A antibody negative Reports for Hepatitis A + B (Twinrix)

#124 most reported symptom for this vaccine

28
Reports
0
Deaths
2
Hospitalizations
0
Mortality Rate
%
7.1
Hosp. Rate
%

Hepatitis A antibody negative and Hepatitis A + B (Twinrix)

Hepatitis A antibody negative has been reported 28 times in association with Hepatitis A + B (Twinrix) vaccination in VAERS. This represents 0.5% of all 5,237 reports for this vaccine.

Among these reports, 0 mentioned death (0.00%) and 2 involved hospitalization (7.1%).

Hepatitis A antibody negative is the #124 most frequently reported symptom for Hepatitis A + B (Twinrix) out of 871 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 28 reports of Hepatitis A antibody negative after Hepatitis A + B (Twinrix) vaccination may seem alarming, but context is critical.

The mortality rate among these reports is very low at 0.00%, suggesting most cases are non-fatal.

Important Context

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

Chest X-ray normal28 reportsNasopharyngitis28 reportsInjection site oedema27 reportsAbdominal pain upper27 reports

Quick Facts

Reports:28
Deaths:0
Hospitalizations:2
% of Vaccine:0.5%
Rank:#124 of 871

Related Pages

Hepatitis A + B (Twinrix) OverviewHepatitis A antibody negative (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.