I was recovering from COVID-19"; Patient received 3 Pfizer vaccine and 4th dose as moderna; This spontaneous case was reported by a consumer and describes the occurrence of COVID-19 (I was recovering from COVID-19") and INTERCHANGE OF VACCINE PRODUCTS (Patient received 3 Pfizer vaccine and 4th dose as moderna) in a  patient of an unknown age and gender who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 057M21A) for COVID-19 vaccination.     Previously administered products included for Drug use for unknown indication: Pfizer / BioNTech (Dose Number: 1 Batch/Lot No: EN6200 Location of injection: Arm Left) on 23-Feb-2021, Pfizer / BioNTech (Dose Number: 2 Batch/Lot No: EN6208 Location of injection: Arm Right) on 16-Mar-2021 and Pfizer / BioNTech (Dose Number: 3 Batch/Lot No: FF2593 Location of injection: Arm Left) on 25-Oct-2021. Past adverse reactions to the above products included No adverse event with Pfizer / BioNTech, Pfizer / BioNTech and Pfizer / BioNTech. Concurrent medical conditions included Hypertension and Drug allergy (unknown historical drug). Concomitant products included LOSARTAN for Heart disorder.    On 29-Apr-2022, the patient received fourth dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 29-Apr-2022, the patient experienced INTERCHANGE OF VACCINE PRODUCTS (Patient received 3 Pfizer vaccine and 4th dose as moderna). On an unknown date, the patient experienced COVID-19 (I was recovering from COVID-19"). The patient was treated with NIRMATRELVIR, RITONAVIR (PAXLOVID) from 13-May-2022 to 17-May-2022 for COVID-19 treatment, at an unspecified dose and frequency. At the time of the report, COVID-19 (I was recovering from COVID-19") had not resolved and INTERCHANGE OF VACCINE PRODUCTS (Patient received 3 Pfizer vaccine and 4th dose as moderna) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 24-May-2022, SARS-CoV-2 test: positive (Positive) Positive. On an unknown date, SARS-CoV-2 test: negative (Negative) Negative and negative (Negative) Negative.         The patient was taking other medications/products within 2 weeks of starting COVID-19 treatment and the patient previously received a COVID-19 vaccine. The patient was recovering from COVID-19 and had two negative tests then a few days later started experiencing symptoms again (mostly congestion). The patient retested and was positive. Treatment information was not provided.  Company comment: This is a spontaneous case concerning a patient of unknown age and gender with no relevant medical history and with vaccine history of receiving first, second and third dose of Covid-19 BioNTech, who experienced the unexpected non-serious AESI event of Covid-19. The event occurrence was unknown with respect to the fourth dose of mRNA-1273 vaccine administration in Covid-19 vaccination in series. The event was described as, on unknown date patient experienced Covid-19. Approximately 14 days after the fourth dose of mRNA-1273 vaccine administration, patient and took Nirmatrelvir + Ritonavir (Paxlovid). On unknown date, patient was recovering from Covid-19 with 2 negative tests. However, few days later patient started having symptoms again mostly congestion. Patient retested with positive result. No other information surrounding the event was reported. The outcome of the event was reported as not resolved. The current Covid-19 pandemic remain confounder for the event. The benefit-risk relationship of mRNA-1273 vaccine is not affected by this report.; Sender's Comments: This is a spontaneous case concerning a patient of unknown age and gender with no relevant medical history and with vaccine history of receiving first, second and third dose of Covid-19 BioNTech, who experienced the unexpected non-serious AESI event of Covid-19. The event occurrence was unknown with respect to the fourth dose of mRNA-1273 vaccine administration in Covid-19 vaccination in series. The event was described as, on unknown date patient experienced Covid-19. Approximately 14 days after the fourth dose of mRNA-1273 vaccine administration, patient and took Nirmatrelvir + Ritonavir (Paxlovid). On unknown date, patient was recovering from Covid-19 with 2 negative tests. However, few days later patient started having symptoms again mostly congestion. Patient retested with positive result. No other information surrounding the event was reported. The outcome of the event was reported as not resolved. The current Covid-19 pandemic remain confounder for the event. The benefit-risk relationship of mRNA-1273 vaccine is not affected by this report.