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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. FLUN(H1N1)
  4. White blood cell count decreased
FLUN(H1N1)×White blood cell count decreased

White blood cell count decreased Reports for FLUN(H1N1)

#175 most reported symptom for this vaccine

12
Reports
1
Deaths
9
Hospitalizations
8.33
Mortality Rate
%
75
Hosp. Rate
%

White blood cell count decreased and FLUN(H1N1)

White blood cell count decreased has been reported 12 times in association with FLUN(H1N1) vaccination in VAERS.

Among these reports, 1 mentioned death (8.33%) and 9 involved hospitalization (75.0%).

White blood cell count decreased is the #175 most frequently reported symptom for FLUN(H1N1) out of 573 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 12 reports of White blood cell count decreased after FLUN(H1N1) vaccination may seem alarming, but context is critical.

The 8.33% 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 White blood cell count decreased occurred after vaccination, not that the vaccine caused it.
•Background rates: White blood cell count decreased 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

Sinus congestion12 reportsX-ray12 reportsIntensive care12 reportsMetabolic function test12 reports

Quick Facts

Reports:12
Deaths:1
Hospitalizations:9
% of Vaccine:—%
Rank:#175 of 573

Related Pages

FLUN(H1N1) OverviewWhite blood cell count decreased (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.