that had the Pfizer Covid vaccine original dose and came in for the 2nd dose in the series and they accidentally gave the patient Moderna; that had the Pfizer Covid vaccine original dose and came in for the 2nd dose in the series and they accidentally gave the patient Moderna; that had the Pfizer Covid vaccine original dose and came in for the 2nd dose in the series and they accidentally gave the patient Moderna; This spontaneous case was reported by a physician and describes the occurrence of INTERCHANGE OF VACCINE PRODUCTS (that had the Pfizer Covid vaccine original dose and came in for the 2nd dose in the series and they accidentally gave the patient Moderna), COVID-19 IMMUNISATION (that had the Pfizer Covid vaccine original dose and came in for the 2nd dose in the series and they accidentally gave the patient Moderna) and NO ADVERSE EVENT (that had the Pfizer Covid vaccine original dose and came in for the 2nd dose in the series and they accidentally gave the patient Moderna) in a patient of an unknown age and gender who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 prophylaxis.     No Medical History information was reported.    On an unknown date, the patient received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On an unknown date, the patient experienced INTERCHANGE OF VACCINE PRODUCTS (that had the Pfizer Covid vaccine original dose and came in for the 2nd dose in the series and they accidentally gave the patient Moderna), COVID-19 IMMUNISATION (that had the Pfizer Covid vaccine original dose and came in for the 2nd dose in the series and they accidentally gave the patient Moderna) and NO ADVERSE EVENT (that had the Pfizer Covid vaccine original dose and came in for the 2nd dose in the series and they accidentally gave the patient Moderna). At the time of the report, INTERCHANGE OF VACCINE PRODUCTS (that had the Pfizer Covid vaccine original dose and came in for the 2nd dose in the series and they accidentally gave the patient Moderna), COVID-19 IMMUNISATION (that had the Pfizer Covid vaccine original dose and came in for the 2nd dose in the series and they accidentally gave the patient Moderna) and NO ADVERSE EVENT (that had the Pfizer Covid vaccine original dose and came in for the 2nd dose in the series and they accidentally gave the patient Moderna) outcome was unknown.        For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter considered NO ADVERSE EVENT (that had the Pfizer Covid vaccine original dose and came in for the 2nd dose in the series and they accidentally gave the patient Moderna) to be not related. No further causality assessments were provided for INTERCHANGE OF VACCINE PRODUCTS (that had the Pfizer Covid vaccine original dose and came in for the 2nd dose in the series and they accidentally gave the patient Moderna) and COVID-19 IMMUNISATION (that had the Pfizer Covid vaccine original dose and came in for the 2nd dose in the series and they accidentally gave the patient Moderna).    No concomitant medications were reported. No treatment medications were reported. This case was identified as part of a retrospective clean-up activity where certain emails received in the Moderna mailbox were missed to be booked-in.