No adverse event; 2 pediatric siblings came in to start the Moderna Covid-19 Primary series. They both received the Moderna bivalent booster instead.; This spontaneous case was reported by a pharmacist and describes the occurrence of WRONG PRODUCT ADMINISTERED (2 pediatric siblings came in to start the Moderna Covid-19 Primary series. They both received the Moderna bivalent booster instead.) and NO ADVERSE EVENT (No adverse event) in a 9-year-old male patient who received mRNA-1273 BIVALENT .222 (MODERNA COVID-19 VACCINE, BIVALENT (ORIGINAL AND OMICRON BA.4/BA.5)) (batch no. 011H22A) for COVID-19 prophylaxis.     Patient did not had no known allergies. it was unknown if patient was diagnosed with covid-19 or not and it was also unknown if patient had any acute illness or choric illness before the vaccination or not.  Concomitant products included INFLUENZA VACCINE (INFLUENZA) for an unknown indication.    On 16-Dec-2022 at 3:38 PM, the patient received first dose of mRNA-1273 BIVALENT .222 (MODERNA COVID-19 VACCINE, BIVALENT (ORIGINAL AND OMICRON BA.4/BA.5)) (Intramuscular) 1 dosage form. On 16-Dec-2022 at 3:38 PM, the patient experienced WRONG PRODUCT ADMINISTERED (2 pediatric siblings came in to start the Moderna Covid-19 Primary series. They both received the Moderna bivalent booster instead.). On an unknown date, the patient experienced NO ADVERSE EVENT (No adverse event). At the time of the report, WRONG PRODUCT ADMINISTERED (2 pediatric siblings came in to start the Moderna Covid-19 Primary series. They both received the Moderna bivalent booster instead.) 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)) (Intramuscular), the reporter considered NO ADVERSE EVENT (No adverse event) to be not related. No further causality assessment was provided for WRONG PRODUCT ADMINISTERED (2 pediatric siblings came in to start the Moderna Covid-19 Primary series. They both received the Moderna bivalent booster instead.).    No Concomitant medication was reported.  It was reported that 2 pediatric siblings came in to start the Moderna Covid-19 Primary series. They both received the Moderna bivalent booster instead. It was also reported that patient did not had an adverse reaction, event or symptoms associated with administration of the vaccination. The situation that occurred was related to a booster dose being given in place of a primary series dose. The patient then presented to receive the second primary series dose and it was then discovered that the dose the patient received one month prior was actually a booster dose instead of the indented first dose in their primary series.  No treatment information was provided.   This case was linked to US-MODERNATX, INC.-MOD-2023-710203 (E2B Linked Report).   Most recent FOLLOW-UP information incorporated above includes: On 22-Feb-2023: Follow-up received contains additional patient reporter information, patient details, dosing date route and site of vaccination , medical history information, concomitant medication and narrative were updated.; Sender's Comments:  US-MODERNATX, INC.-MOD-2023-710203:Master case