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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. Yellow Fever (YF-Vax)
  4. Laboratory test
Yellow Fever (YF-Vax)×Laboratory test

Laboratory test Reports for Yellow Fever (YF-Vax)

#140 most reported symptom for this vaccine

30
Reports
0
Deaths
10
Hospitalizations
0
Mortality Rate
%
33.3
Hosp. Rate
%

Laboratory test and Yellow Fever (YF-Vax)

Laboratory test has been reported 30 times in association with Yellow Fever (YF-Vax) vaccination in VAERS. This represents 0.6% of all 4,996 reports for this vaccine.

Among these reports, 0 mentioned death (0.00%) and 10 involved hospitalization (33.3%).

Laboratory test is the #140 most frequently reported symptom for Yellow Fever (YF-Vax) out of 959 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 30 reports of Laboratory test after Yellow Fever (YF-Vax) 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 Laboratory test occurred after vaccination, not that the vaccine caused it.
•Background rates: Laboratory test 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

Blood test30 reportsIncorrect dose administered30 reportsMyocardial infarction29 reportsFall29 reports

Quick Facts

Reports:30
Deaths:0
Hospitalizations:10
% of Vaccine:0.6%
Rank:#140 of 959

Related Pages

Yellow Fever (YF-Vax) OverviewLaboratory test (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.