| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| Immune response induced by SARS-CoV-2 vaccination. |  | 
| E.1.1.1 | Medical condition in easily understood language | 
| Immune response induced by COVID-19 vaccination. |  | 
| E.1.1.2 | Therapeutic area | Body processes [G] - Immune system processes [G12] | 
| MedDRA Classification | 
| E.1.3 | Condition being studied is a rare disease | No | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial | 
| This is an observational study independent of national vaccination program. We will evaluate the dynamics and the clinical protective properties of the antibodies induces by SARS-CoV-2 vaccines. |  | 
| E.2.2 | Secondary objectives of the trial | 
| To evaluate the feasibility of the rapid SARS-CoV-2 antibody testing in the context of force health protection. |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| Eligible individuals 1. Belong to the Finnish Defence Forces' personnel or are undergoing their military service AND
 2. Have not yet received vaccinations against COVID-19, but are planning to receive them in the near future AND
 3. Have sufficient skills in Finnish AND
 4. Are free from conditions that increase blood draw related risks.
 
 |  | 
| E.4 | Principal exclusion criteria | 
| Exclusion criteria: Individuals who
 1. Do not fulfill inclusion criteria OR
 2. Cannot participate in the study as described in the Study Protocol
 - Do not understand the study concept
 - Cannot give their written informed consent
 - Are not willing to give the required information or blood samples
 - Have any health related or social situation associated conditions that may worsen if the individual participates in this study.
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| Immune response induced by the SARS-CoV-2 vaccination: 1. Immunoglobulin class M, G and A antibodies (quantitative and qualitative analyses)
 2. Neutralizing antibodies (semi-quantitative analyses)
 3. Rapid antibody tests vs. conventional serological assessments.
 |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| Cross-sectional analyses at 3, 6, 12, and 15 months and longitudinal trends during the whole follow-up time . |  | 
| E.5.2 | Secondary end point(s) | 
| Feasibility of the rapid antibody tests in the military context. 
 |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
| At the end of the study; when all samples and data are gathered and available for the analyses. |  | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis | No | 
| E.6.2 | Prophylaxis | Yes | 
| E.6.3 | Therapy | No | 
| E.6.4 | Safety | No | 
| E.6.5 | Efficacy | No | 
| E.6.6 | Pharmacokinetic | No | 
| E.6.7 | Pharmacodynamic | No | 
| E.6.8 | Bioequivalence | No | 
| E.6.9 | Dose response | No | 
| E.6.10 | Pharmacogenetic | No | 
| E.6.11 | Pharmacogenomic | No | 
| E.6.12 | Pharmacoeconomic | No | 
| E.6.13 | Others | No | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) | No | 
| E.7.1.1 | First administration to humans | No | 
| E.7.1.2 | Bioequivalence study | No | 
| E.7.1.3 | Other | No | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) | No | 
| E.7.3 | Therapeutic confirmatory (Phase III) | No | 
| E.7.4 | Therapeutic use (Phase IV) | Yes | 
| E.8 Design of the trial | 
| E.8.1 | Controlled | No | 
| E.8.1.1 | Randomised | No | 
| E.8.1.2 | Open | No | 
| E.8.1.3 | Single blind | No | 
| E.8.1.4 | Double blind | No | 
| E.8.1.5 | Parallel group | No | 
| E.8.1.6 | Cross over | No | 
| E.8.1.7 | Other | Yes | 
| E.8.1.7.1 | Other trial design description | 
| Observational prospective cohort study |  | 
| E.8.2 | Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) | No | 
| E.8.2.2 | Placebo | No | 
| E.8.2.3 | Other | No | 
| E.8.3 | The trial involves single site in the Member State concerned | No | 
| E.8.4 | The trial involves multiple sites in the Member State concerned | Yes | 
| E.8.4.1 | Number of sites anticipated in Member State concerned | 4 | 
| E.8.5 | The trial involves multiple Member States | No | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA | No | 
| E.8.6.2 | Trial being conducted completely outside of the EEA | No | 
| E.8.7 | Trial has a data monitoring committee | No | 
| E.8.8 | Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial | 
| The last contact via internet questionnaire at 18 months. |  | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 2 | 
| E.8.9.1 | In the Member State concerned months | 0 | 
| E.8.9.1 | In the Member State concerned days | 0 |