inclusion criteria: * aged greater than or equal to \>= 65 years of age on the day of inclusion. * in good health or with underlying medical condition(s) that were judged to be stable by the investigator. a stable medical condition was defined as disease not requiring significant change in therapy or hospitalization for worsening disease during the 3 months before enrollment. * participants who previously received 2 injections of moderna covid-19 vaccine with the second dose received at least 5 months before visit 1. * abled to attend all scheduled visits and to complied with all study procedures.

inclusion criteria: * aged greater than or equal to \>= 65 years of age on the day of inclusion. * in good health or with underlying medical condition(s) that were judged to be stable by the investigator. a stable medical condition was defined as disease not requiring significant change in therapy or hospitalization for worsening disease during the 3 months before enrollment. * participants who previously received 2 injections of moderna covid-19 vaccine with the second dose received at least 5 months before visit 1. * abled to attend all scheduled visits and to complied with all study procedures.

inclusion criteria: aged greater than or equal to >= 65 years of age on the day of inclusion. in good health or with underlying medical condition(s) that were judged to be stable by the investigator. a stable medical condition was defined as disease not requiring significant change in therapy or hospitalization for worsening disease during the 3 months before enrollment. participants who previously received 2 injections of moderna covid-19 vaccine with the second dose received at least 5 months before visit 1. abled to attend all scheduled visits and to complied with all study procedures.

inclusion criteria: aged greater than or equal to >= 65 years of age on the day of inclusion. in good health or with underlying medical condition(s) that were judged to be stable by the investigator. a stable medical condition was defined as disease not requiring significant change in therapy or hospitalization for worsening disease during the 3 months before enrollment. participants who previously received 2 injections of moderna covid-19 vaccine with the second dose received at least 5 months before visit 1. abled to attend all scheduled visits and to complied with all study procedures.

inclusion criteria: aged ≥ 65 years of age on the day of inclusion in good health or with underlying medical condition(s) that are judged to be stable by the investigator. a stable medical condition is defined as disease not requiring significant change in therapy or hospitalization for worsening disease during the 3 months before enrollment participants who previously received 2 injections of moderna covid-19 vaccine with the second dose received at least 5 months before visit 1 able to attend all scheduled visits and to comply with all study procedures - - - -

inclusion criteria: aged ≥ 65 years of age on the day of inclusion in good health or with underlying medical condition(s) that are judged to be stable by the investigator. a stable medical condition is defined as disease not requiring significant change in therapy or hospitalization for worsening disease during the 3 months before enrollment participants who previously received 2 injections of moderna covid-19 vaccine with the second dose received at least 5 months before visit 1 able to attend all scheduled visits and to comply with all study procedures - - - -