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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 (MMR II)
  4. Pneumonia
Measles, Mumps & Rubella (MMR II)×Pneumonia

Pneumonia Reports for Measles, Mumps & Rubella (MMR II)

#151 most reported symptom for this vaccine

327
Reports
34
Deaths
158
Hospitalizations
10.4
Mortality Rate
%
48.3
Hosp. Rate
%

Pneumonia and Measles, Mumps & Rubella (MMR II)

Pneumonia has been reported 327 times in association with Measles, Mumps & Rubella (MMR II) vaccination in VAERS. This represents 0.4% of all 89,976 reports for this vaccine.

Among these reports, 34 mentioned death (10.40%) and 158 involved hospitalization (48.3%).

Pneumonia is the #151 most frequently reported symptom for Measles, Mumps & Rubella (MMR II) out of 2292 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 327 reports of Pneumonia after Measles, Mumps & Rubella (MMR II) vaccination may seem alarming, but context is critical.

The 10.40% 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 Pneumonia occurred after vaccination, not that the vaccine caused it.
•Background rates: Pneumonia 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

Staring332 reportsRubella antibody negative331 reportsVaccination complication324 reportsBlood test322 reports

Quick Facts

Reports:327
Deaths:34
Hospitalizations:158
% of Vaccine:0.4%
Rank:#151 of 2292

Related Pages

Measles, Mumps & Rubella (MMR II) OverviewPneumonia (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.