COVID-19/Ear ache,Head pressure; Interchange of vaccine products; This spontaneous case was reported by a patient and describes the occurrence of COVID-19 (COVID-19/Ear ache,Head pressure) and INTERCHANGE OF VACCINE PRODUCTS (Interchange of vaccine products) in a 55-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 029h21b) for COVID-19 prophylaxis.     Previously administered products included for Product used for unknown indication: Pfizer (Dose number: 1, Batch/Lot no: el3247, location of injection : Right Arm, Administration time: 1.00 PM, Route of administration: Intramuscular) on 02-Mar-2021, Pfizer (Dose number: 2, Batch/Lot no: er8732, location of injection : Right Arm, Administration time: 2.00 PM and Route of administration : Intramuscular) on 02-Apr-2021. Past adverse reactions to the above products included No adverse event with Pfizer and Pfizer. Concurrent medical conditions included Drug allergy (Allergy to unknown drug). Concomitant products included VITAMIN C [ASCORBIC ACID] for an unknown indication.    On 23-Mar-2022 at 5:00 PM, the patient received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 23-Mar-2022, the patient experienced INTERCHANGE OF VACCINE PRODUCTS (Interchange of vaccine products). On 08-Jun-2022, the patient experienced COVID-19 (COVID-19/Ear ache,Head pressure). At the time of the report, COVID-19 (COVID-19/Ear ache,Head pressure) and INTERCHANGE OF VACCINE PRODUCTS (Interchange of vaccine products) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 30-May-2022, SARS-CoV-2 test: negative (Negative) Negative. On 01-Jun-2022, SARS-CoV-2 test: negative (Negative) Negative. On 08-Jun-2022, SARS-CoV-2 test: positive (Positive) Positive.         The patient did not received any other vaccine within 4 weeks prior to Covid vaccine.  Hospitalization prolonged and treatment received was reported as No.  Company Comment: This spontaneous case of Interchange of vaccine products concerns a 55-year-old female patient, with previous Pfizer vaccinations, who experienced the unexpected of COVID-19. The event occurred approximately 2 months 14 days after receiving the third dose of mRNA-1273 Vaccine. The patient had a positive SARS-CoV-2 test result. Treatment information was not provided. The outcome of the event was reported as unknown. The patient's medical history of previous Pfizer vaccinations remain as confounders for the occurrence of the event. The benefit-risk relationship of mRNA-1273 Vaccine is not affected by this report.; Sender's Comments: This spontaneous case of Interchange of vaccine products concerns a 55-year-old female patient, with previous Pfizer vaccinations, who experienced the unexpected  of COVID-19. The event occurred approximately 2 months 14 days after receiving the third dose of mRNA-1273 Vaccine. The patient had a positive SARS-CoV-2 test result. Treatment information was not provided. The outcome of the event was reported as unknown. The patient's medical history of previous Pfizer vaccinations remain as confounders for the occurrence of the event. The benefit-risk relationship of mRNA-1273 Vaccine is not affected by this report.