she accidentally received Moderna bivalent vaccine and the Pfizer vaccine on 01-May-2023; No adverse event; she accidentally received Moderna bivalent vaccine and the Pfizer vaccine on 01-May-2023; This spontaneous case was reported by an other health care professional and describes the occurrence of EXTRA DOSE ADMINISTERED (she accidentally received Moderna bivalent vaccine and the Pfizer vaccine on 01-May-2023), PRODUCT ADMINISTRATION ERROR (she accidentally received Moderna bivalent vaccine and the Pfizer vaccine on 01-May-2023) and NO ADVERSE EVENT (No adverse event) in a 4-year-old female patient who received mRNA-1273 BIVALENT .222 (MODERNA COVID-19 VACCINE, BIVALENT (ORIGINAL AND OMICRON BA.4/BA.5)) (batch no. 216K22A) for COVID-19 prophylaxis.     Patient did not report having disease or allergy.  Previously administered products included for Product used for unknown indication: COVID-19 VACCINE (Dose 1, AR9237B) on 18-Aug-2022, COVID-19 VACCINE (Dose 2, AR9237B) on 15-Sep-2022 and MMR VACCIN. Past adverse reactions to the above products included No adverse event with COVID-19 VACCINE, COVID-19 VACCINE and MMR VACCIN. Concomitant products included FAMTOZINAMERAN, TOZINAMERAN (PFIZER BIONTECH COVID-19 VACCINE, BIVALENT (ORIGINAL AND OMICRON BA.4/5)) from 01-May-2023 to an unknown date for an unknown indication.    On 01-May-2023, the patient received third dose of mRNA-1273 BIVALENT .222 (MODERNA COVID-19 VACCINE, BIVALENT (ORIGINAL AND OMICRON BA.4/BA.5)) (unknown route) .2 milliliter. On 01-May-2023, the patient experienced EXTRA DOSE ADMINISTERED (she accidentally received Moderna bivalent vaccine and the Pfizer vaccine on 01-May-2023). On an unknown date, the patient experienced PRODUCT ADMINISTRATION ERROR (she accidentally received Moderna bivalent vaccine and the Pfizer vaccine on 01-May-2023) and NO ADVERSE EVENT (No adverse event). At the time of the report, EXTRA DOSE ADMINISTERED (she accidentally received Moderna bivalent vaccine and the Pfizer vaccine on 01-May-2023), PRODUCT ADMINISTRATION ERROR (she accidentally received Moderna bivalent vaccine and the Pfizer vaccine on 01-May-2023) and NO ADVERSE EVENT (No adverse event) outcome was unknown.        For mRNA-1273 BIVALENT .222 (MODERNA COVID-19 VACCINE, BIVALENT (ORIGINAL AND OMICRON BA.4/BA.5)) (Unknown), the reporter considered NO ADVERSE EVENT (No adverse event) to be not related. No further causality assessments were provided for EXTRA DOSE ADMINISTERED (she accidentally received Moderna bivalent vaccine and the Pfizer vaccine on 01-May-2023) and PRODUCT ADMINISTRATION ERROR (she accidentally received Moderna bivalent vaccine and the Pfizer vaccine on 01-May-2023).    No concomitant medications were reported.   Patient received other vaccines in the 4 weeks prior to COVID-19 vaccine.  HCP was calling to report they accidently administered the Moderna bivalent vaccine and the Pfizer vaccine on 01-May-2023 to a 4-year-old patient. The patient was supposed to get 2 other vaccines with the Moderna, the MMR V ProQuad vaccine and the Quadracel vaccine with polio and dtap. However, the patient did not get the Quadracel vaccine but accidently received the Pfizer bivalent vaccine for 6 months to 4 years.  No treatment medication was provided.    Most recent FOLLOW-UP information incorporated above includes: On 02-May-2023: Follow-up received included no new information.