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Report #2878039

Received Dec 16, 2025

A note on interpretation. VAERS reports are unverified and may be incomplete or coincidental. A report does not establish that a vaccine caused an event, and counts should not be used to calculate incidence or infer causation. Full disclaimer

Overview

Sex
Unknown
Age
Age unknown
State
AL
Recovered
Unknown
Vaccinated
Dec 2, 2025
Onset
Dec 2, 2025
Days to onset
0
Hospital days
—

Vaccines (1)

TypeNameManufacturerDoseLotRoute / Site
MMRMEASLES + MUMPS + RUBELLA (MMR II)MERCK & CO. INC.UNKZ004812—

Symptoms (2)

No adverse eventUnderdose

Symptom narrative

No additional AE/no PQC; 4 years old patient received a half dose (0.25 ml) of 2nd dose of MMRII; This spontaneous report was received from a Physician on 02-Dec-2025 and refers to a 4-year-old patient of unknown gender. The patient's medical history, concurrent conditions and concomitant therapies were not reported. On 02-Dec-2025, the patient was vaccinated with a half dose of Measles, Mumps, and Rubella (Wistar RA 27-3) Virus Vaccine, Live (M-M-R II), Injection (lot #Z004812, expiration date: 20-Feb-2027), dose:0.25 mL (0.25 ml), (route, and dose number were unspecified) for Prophylaxis(Underdose). The vaccine was reconstituted with sterile diluent (Hollister-Stier STERILE DILUENT), dose:0.25 mL (0.25 ml), (route, dose number,lot# and expiration date were unspecified) for Prophylaxis., on 02-Dec-2025 No additional adverse event or PQC was reported.

Other medications

MERCK STERILE DILUENT