primary dose of Johnson & Johnson's COVID-19 vaccine,  booster dose of mRNA-1273 vaccine; tested positive for COVID-19 after Moderna booster; This spontaneous case was reported by a nurse and describes the occurrence of COVID-19 (tested positive for COVID-19 after Moderna booster) and INTERCHANGE OF VACCINE PRODUCTS (primary dose of Johnson & Johnson's COVID-19 vaccine,  booster dose of mRNA-1273 vaccine) in an adult patient of an unknown gender who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 prophylaxis.     Previously administered products included for Product used for unknown indication: Johnson and Johnson (Johnson and Johnson for primary series). Past adverse reactions to the above products included No adverse event with Johnson and Johnson.    In October 2021, the patient received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 13-Jun-2022, the patient experienced COVID-19 (tested positive for COVID-19 after Moderna booster). On an unknown date, the patient experienced INTERCHANGE OF VACCINE PRODUCTS (primary dose of Johnson & Johnson's COVID-19 vaccine,  booster dose of mRNA-1273 vaccine). At the time of the report, COVID-19 (tested positive for COVID-19 after Moderna booster) and INTERCHANGE OF VACCINE PRODUCTS (primary dose of Johnson & Johnson's COVID-19 vaccine,  booster dose of mRNA-1273 vaccine) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 13-Jun-2022, SARS-CoV-2 test positive: positive (Positive) Nurse has 2 patient is in their 30s that had one booster, but both came down with covid a week ago on Tuesday (13JUN2022)..     For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   Reportedly, a 30 plus-year-old patient of unknown gender received a primary dose of Johnson & Johnson's COVID-19 vaccine on an unknown date, followed by a booster dose of mRNA-1273 vaccine in October. On 13 Jun 2022, patient tested positive with COVID-19. Concomitant medications were not provided by the reporter. Treatment information was not provided.  Company Comment: This spontaneous case concerns a 30 plus-year-old patient of unknown gender with no reported medical conditions, who experienced an unexpected, non-serious AESI COVID-19 that was confirmed with a positive COVID-19 test approximately 8 months post-vaccination with a booster dose of mRNA-1273 vaccine. Exact onset latency of COVID-19 relative to mRNA-1273 vaccination cannot be determined with an unspecified vaccination date. Patient received a primary dose of Janssen's COVID-19 vaccine before vaccination with the booster dose (Interchange of vaccine products). Further details on the medical history, clinical course, diagnostics, and treatments were not reported. Case is confounded by interchange of vaccine products. The benefit-risk relationship of mRNA-1273 is not affected by this report. Event's seriousness assessed based on medical judgement and the available information.; Sender's Comments: This spontaneous case concerns a 30 plus-year-old patient of unknown gender with no reported medical conditions, who experienced an unexpected, non-serious AESI COVID-19 that was confirmed with a positive COVID-19 test approximately 8 months post-vaccination with a booster dose of mRNA-1273 vaccine. Exact onset latency of COVID-19 relative to mRNA-1273 vaccination cannot be determined with an unspecified vaccination date. Patient received a primary dose of Janssen's COVID-19 vaccine before vaccination with the booster dose (Interchange of vaccine products). Further details on the medical history, clinical course, diagnostics, and treatments were not reported. Case is confounded by interchange of vaccine products. The benefit-risk relationship of mRNA-1273 is not affected by this report. Event's seriousness assessed based on medical judgement and the available information.