On 9Mar2023 the vial was initially stored in the refrigerator and same day vaccine was administered, the vial had expired as of 11Feb2023; No adverse event; 17 month old patient received her first dose of the series in her primary vaccination series was expired Moderna Covid-19 vaccine/ Dose administered after manufacturer date of expiry; This spontaneous case was reported by an other health care professional and describes the occurrence of EXPIRED PRODUCT ADMINISTERED (17 month old patient received her first dose of the series in her primary vaccination series was expired Moderna Covid-19 vaccine/ Dose administered after manufacturer date of expiry), PRODUCT STORAGE ERROR (On 9Mar2023 the vial was initially stored in the refrigerator and same day vaccine was administered, the vial had expired as of 11Feb2023) and NO ADVERSE EVENT (No adverse event) in a 17-month-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. AR9236B) for COVID-19 prophylaxis.     Patient did not receive any other vaccines in the 4 weeks prior to COVID-19 vaccine.     On 09-Mar-2023, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 09-Mar-2023, the patient experienced EXPIRED PRODUCT ADMINISTERED (17 month old patient received her first dose of the series in her primary vaccination series was expired Moderna Covid-19 vaccine/ Dose administered after manufacturer date of expiry). On an unknown date, the patient experienced PRODUCT STORAGE ERROR (On 9Mar2023 the vial was initially stored in the refrigerator and same day vaccine was administered, the vial had expired as of 11Feb2023) and NO ADVERSE EVENT (No adverse event). At the time of the report, EXPIRED PRODUCT ADMINISTERED (17 month old patient received her first dose of the series in her primary vaccination series was expired Moderna Covid-19 vaccine/ Dose administered after manufacturer date of expiry), PRODUCT STORAGE ERROR (On 9Mar2023 the vial was initially stored in the refrigerator and same day vaccine was administered, the vial had expired as of 11Feb2023) and NO ADVERSE EVENT (No adverse event) outcome was unknown.        For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter considered NO ADVERSE EVENT (No adverse event) to be not related. No further causality assessments were provided for EXPIRED PRODUCT ADMINISTERED (17 month old patient received her first dose of the series in her primary vaccination series was expired Moderna Covid-19 vaccine/ Dose administered after manufacturer date of expiry) and PRODUCT STORAGE ERROR (On 9Mar2023 the vial was initially stored in the refrigerator and same day vaccine was administered, the vial had expired as of 11Feb2023).    No concomitant medications were reported.  A 17-month-old came in for his first Covid vaccine. The vial was taken from the freezer today and was placed at room temp to thaw. After the child left, we noticed that the vial had expired as of 11Feb2023.  The caller is a medical assistant and office manager. Monovalent 6m-5y vaccine was received with Lot number AR9236B. Vial size was reported as unknown. On 9Mar2023 the vial was initially stored in the refrigerator and same day vaccine was administered.  The vial did not undergo any temperature excursions.  No treatment medications were reported.   Most recent FOLLOW-UP information incorporated above includes: On 10-Mar-2023: Live significant FU contains Reporter details, patient details and dose details were added. Narrative updated.