No additional AE/no PQC reported.; CRT agent transferred nurse who called to report a 4th dose of GARDASIL 9 was inadvertently administered to a patient. Caller stated patient received doses of GARDASIL 9 on 12/29/2023, 3/15/2024, 7/18/2024, and then received 4th dose on 11/1/2024. Ca; This spontaneous report was received from nurse and refers to a 23-year-old patient of unknown gender. The patient’s medical history was not reported. The patient’s concurrent conditions were not reported. Concomitant therapies were not reported. On 29-DEC-2023, 15-MAR-2023 and 18-JUL-2024 the patient was vaccinated with first, second and third doses of hpv rl1 6 11 16 18 31 33 45 52 58 vlp vaccine (yeast) (GARDASIL 9) injection, administered for prophylaxis (strength, exact doses, lot #, expiry dates, and anatomical routes of administration were not provided). In addition, on 01-NOV-2024, the patient received 4th dose of hpv rl1 6 11 16 18 31 33 45 52 58 vlp vaccine (yeast) (GARDASIL 9) injection, lot #Y013469 (who had been verified to be a valid number, expiration date reported as 10-OCT-2026) (Extra dose administered). No additional adverse event.