Received May 5, 2026
| Type | Name | Manufacturer | Dose | Lot | Route / Site |
|---|---|---|---|---|---|
| MMRV | MEASLES + MUMPS + RUBELLA + VARICELLA (PROQUAD) | MERCK & CO. INC. | 1 | Z015275 | OT / RA |
| VARCEL | VARICELLA (VARIVAX) | MERCK & CO. INC. | 2 | Z008083 | OT / LA |
no additional adverse event; Incorrect vaccine given/vaccine error; concomitant administration of PROQUAD and VARIVAX because of user error; This spontaneous report was received from a Nurse and referred to a 2-year-old patient of unknown gender. The patient's medical history, concurrent conditions and concomitant medications were not reported. On 06-Apr-2026, the patient started therapy with MMR and Varicella (Oka-Merck)(PROQUAD) 0.5 mL (total) Batch/Lot Number: Z015275 has been verified to be a valid batch/lot number for MMR and Varicella (Oka-Merck), with expiration date: 30-Mar-2027, as prophylaxis (route of administration was not reported), the vaccine was reconstituted with sterile diluent (MERCK STERILE DILUENT) (lot # 1973319, expiration date: 17-Nov-2026); the patient also received Varicella Virus Vaccine Live (Oka-Merck)(VARIVAX) 0.5 mL (total) Batch/Lot Number: Z008083 has been verified to be a valid batch/lot number for Varicella Virus Vaccine Live (Oka-Merck) with expiration date: 28-Apr-2027, as prophylaxis (route of administration was not reported) because of user error (Accidental overdose). The vaccine was reconstituted with sterile diluent (MERCK STERILE DILUENT) (lot # 1973319, expiration date: 17-Nov-2026). No additional adverse events were reported. Follow up information was received from a manager clinic on 22-Apr-2026, concerning a male patient. The patient's concomitant medications included diphtheria vaccine toxoid;pertussis vaccine acellular;tetanus vaccine toxoid (DTAP). On 06-Apr-2026, the patient was vaccinated with the second dose of Varicella Virus Vaccine Live (Oka-Merck)(VARIVAX) in the left deltoid via intramuscular (information regarding the first dose was not provided) and the first dose of MMR and Varicella (Oka-Merck) virus vaccine live (PROQUAD) (reported as MMR, discrepancy) was administered in the right deltoid (route of administration not provided) (wrong product administered). The suspect vaccines were given by a trained healthcare professional. It was unknown if a drug treatment was prescribed. On an unspecified day, the patient recovered from wrong vaccine administered. The reporter considered the event of wrong vaccine administered to be other medically important condition.
DTap; STERILE DILUENT