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 - - - -