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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. Measles, Mumps, Rubella & Varicella (Proquad)
  4. Wrong drug administered
Measles, Mumps, Rubella & Varicella (Proquad)×Wrong drug administered

Wrong drug administered Reports for Measles, Mumps, Rubella & Varicella (Proquad)

#21 most reported symptom for this vaccine

458
Reports
0
Deaths
2
Hospitalizations
0
Mortality Rate
%
0.4
Hosp. Rate
%

Wrong drug administered and Measles, Mumps, Rubella & Varicella (Proquad)

Wrong drug administered has been reported 458 times in association with Measles, Mumps, Rubella & Varicella (Proquad) vaccination in VAERS. This represents 1.9% of all 23,562 reports for this vaccine.

Among these reports, 0 mentioned death (0.00%) and 2 involved hospitalization (0.4%).

Wrong drug administered is the #21 most frequently reported symptom for Measles, Mumps, Rubella & Varicella (Proquad) out of 936 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 458 reports of Wrong drug administered after Measles, Mumps, Rubella & Varicella (Proquad) 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 Wrong drug administered occurred after vaccination, not that the vaccine caused it.
•Background rates: Wrong drug administered 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

Swelling487 reportsSkin warm481 reportsRash erythematous447 reportsInjection site rash446 reports

Quick Facts

Reports:458
Deaths:0
Hospitalizations:2
% of Vaccine:1.9%
Rank:#21 of 936

Related Pages

Measles, Mumps, Rubella & Varicella (Proquad) OverviewWrong drug administered (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.