delayed period; this case was received via regulatory authority, ra (reference number: gb-mhra-adr 26657192) on 28-feb-2022 and was forwarded to moderna on 28-feb-2022. this regulatory authority case was reported by a consumer and describes the occurrence of menstruation delayed (delayed period) in a 46-year-old female patient who received mrna-1273 (moderna covid-19 vaccine) for adverse drug reaction nos. no medical history information was reported. on 04-sep-2021, the patient received dose of mrna-1273 (moderna covid-19 vaccine) (unknown route) 1 dosage form. on 04-sep-2021, the patient experienced menstruation delayed (delayed period) (seriousness criterion disability). at the time of the report, menstruation delayed (delayed period) had not resolved. patient obtained the medicine at park and ride. the reaction did not occurred as a result of a mistake made in the administration of the vaccine. no concomitant medication provided. no treatment medication reported. company comment: this is a regulatory case concerning a 46-year-old female patient with no medical history reported, who experienced the unexpected serious (due to disability) event of menstruation delayed, on the same day after a dose of mrna-1273 vaccine (no information was disclosed on other doses or dose number), which had not recovered at the time of the report. the benefit-risk relationship of mrna-1273 vaccine is not affected by this report. event�s seriousness assessed as reported.; sender's comments: this is a regulatory case concerning a 46-year-old female patient with no medical history reported, who experienced the unexpected serious (due to disability) event of menstruation delayed, on the same day after a dose of mrna-1273 vaccine (no information was disclosed on other doses or dose number), which had not recovered at the time of the report. the benefit-risk relationship of mrna-1273 vaccine is not affected by this report. event�s seriousness assessed as reported