Received Oct 31, 2025
| Type | Name | Manufacturer | Dose | Lot | Route / Site |
|---|---|---|---|---|---|
| MMR | MEASLES + MUMPS + RUBELLA (MMR II) | MERCK & CO. INC. | UNK | — | OT |
| MMRV | MEASLES + MUMPS + RUBELLA + VARICELLA (PROQUAD) | MERCK & CO. INC. | UNK | — | OT |
| UNK | VACCINE NOT SPECIFIED (NO BRAND NAME) | UNKNOWN MANUFACTURER | UNK | — | OT |
No additional AE; inadvertent concomitant administration of MMR II and PROQUAD (in place of VARIVAX) to a 1 yr old infant, today, 10/9/2025.; inadvertent concomitant administration of MMR II and PROQUAD (in place of VARIVAX) to a 1 yr old infant, today, 10/9/2025.; This spontaneous report was received from a physician and refers to a 1-year-old patient of unknown gender. The patient's medical history was not reported. The patient's concurrent conditions were not reported. Concomitant therapies were not reported. On 09-Oct-2025, the patient was vaccinated with Measles, Mumps, and Rubella (Wistar RA 27-3) Virus Vaccine, Live (M-M-R II) solution for injection 0.5 mL (.5ML), given by unknown route as prophylaxis (lot # and expiration date were not reported), which was inadvertently administered with Measles, Mumps, Rubella and Varicella (Oka-Merck) Virus Vaccine Live (PROQUAD) solution for injection 0.5 mL (.5ML), administered by unknown route as prophylaxis (lot # and expiration date were not reported), instead of Varicella Virus Vaccine Live (Oka-Merck) lyophilisate and solvent for (VARIVAX) (Accidental overdose, Wrong product administered). The vaccines were reconstituted with sterile diluent (lot # and expiration date were not reported). The outcome of the events and the action taken with the suspect vaccines were not provided. No additional adverse events.