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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. Pneumococcal (Prevnar20)
  4. White blood cell count increased
Pneumococcal (Prevnar20)×White blood cell count increased

White blood cell count increased Reports for Pneumococcal (Prevnar20)

#150 most reported symptom for this vaccine

28
Reports
3
Deaths
11
Hospitalizations
10.71
Mortality Rate
%
39.3
Hosp. Rate
%

White blood cell count increased and Pneumococcal (Prevnar20)

White blood cell count increased has been reported 28 times in association with Pneumococcal (Prevnar20) vaccination in VAERS. This represents 0.4% of all 7,154 reports for this vaccine.

Among these reports, 3 mentioned death (10.71%) and 11 involved hospitalization (39.3%).

White blood cell count increased is the #150 most frequently reported symptom for Pneumococcal (Prevnar20) out of 802 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 White blood cell count increased after Pneumococcal (Prevnar20) vaccination may seem alarming, but context is critical.

The 10.71% 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 increased occurred after vaccination, not that the vaccine caused it.
•Background rates: White blood cell count increased 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

Dysphagia28 reportsBlood pressure increased28 reportsImmunoglobulin therapy28 reportsOedema peripheral27 reports

Quick Facts

Reports:28
Deaths:3
Hospitalizations:11
% of Vaccine:0.4%
Rank:#150 of 802

Related Pages

Pneumococcal (Prevnar20) OverviewWhite blood cell count increased (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.