VAERS Explorer
Back to explore

Report #2895256

Received May 4, 2026

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
Female
Age
32 yrs
State
KS
Recovered
Unknown
Vaccinated
Jan 9, 2026
Onset
Apr 16, 2026
Days to onset
97
Hospital days

Vaccines (2)

TypeNameManufacturerDoseLotRoute / Site
MMRMEASLES + MUMPS + RUBELLA (NO BRAND NAME)UNKNOWN MANUFACTURER1
MMRVMEASLES + MUMPS + RUBELLA + VARICELLA (PROQUAD)MERCK & CO. INC.UNKZ010383

Symptoms (2)

No adverse eventWrong product administered

Symptom narrative

Confirmed no symptomatic adverse events. No additional AE; The patient was updating their immunization and received MMR vaccine on 9-JAN-2026. The patient then came to get their second dose on 16-APR-2026 and was accidently administered PROQUAD.; on 16-APR-2026 and was accidently administered PROQUAD; This spontaneous report was received from a registered nurse (R.N.) and refers to a 32-year-old female patient. The patient's medical history, concurrent conditions, past medications and concomitant medications were not reported. On 09-Jan-2026, the patient was vaccinated with the first dose of measles, mumps, and rubella (wistar ra 27-3) virus vaccine, live (manufacturer unknown) (reported as "MMR vaccine") powder and solvent for solution for injection (exact dose, route of administration, anatomical location, lot# and expiry date were not reported), for prophylaxis (updating their immunization). The vaccine was reconstituted with sterile diluent (lot# and expiry date not reported). On 16-Apr-2026, the patient came to receive the second dose but accidentally was vaccinated with MMR and Varicella (Oka-Merck) Virus Vaccine Live (PROQUAD) powder and solvent for solution for injection, 0.5 ml, once, lot# Z010383, expiration date: 14-Dec-2026 (route of administration and anatomical location were not reported), reconstituted with sterile diluent (lot# and expiry date were not reported), for prophylaxis (Wrong product administered, Product administered to patient of inappropriate age). Confirmed no symptomatic adverse events, no additional adverse events occurred. Lot # is being requested and will be submitted if received (for MMR vaccine).

Other medications

DILUENT MRK