inclusion criteria: * all subjects from study clo-scb-2019-001 will automatically move on to this long-term follow-up study if: 1) they have given informed consent for this follow-up study; and 2) they have completed the d184 visit of study clo-scb-2019-001 (ie, 6 months post the 1 st vaccination).

inclusion criteria: * all subjects from study clo-scb-2019-001 will automatically move on to this long-term follow-up study if: 1) they have given informed consent for this follow-up study; and 2) they have completed the d184 visit of study clo-scb-2019-001 (ie, 6 months post the 1 st vaccination).

inclusion criteria: - all subjects from study clo-scb-2019-001 will automatically move on to this long-term follow-up study if: 1) they have given informed consent for this follow-up study; and 2) they have completed the d184 visit of study clo-scb-2019-001 (ie, 6 months post the 1 st vaccination).

inclusion criteria: - all subjects from study clo-scb-2019-001 will automatically move on to this long-term follow-up study if: 1) they have given informed consent for this follow-up study; and 2) they have completed the d184 visit of study clo-scb-2019-001 (ie, 6 months post the 1 st vaccination).