| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated  | 
| Safety and immunogenicity after revaccination with Spikevax in healthy adults who have received Comirnaty as a primary vaccine | 
 
| Veiligheid en immunogeniciteit van revaccinatie met Spikevax bij gezonde proefpersonen die de primaire vaccinatie serie met Comirnaty hebben gehad | 
 
 
 | 
| E.1.1.1 | Medical condition in easily understood language  | 
| healthy persons | 
 
| gezonde proefpersonen | 
 
 
 | 
| E.1.1.2 | Therapeutic area  | Diseases [C] - Virus Diseases [C02] | 
| 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  | 
| Study safety and immunogenicity against SARS-CoV-2 after revaccination with Spikevax in fractional doses and with a skin patch | 
 
| Onderzoeken van veiligheid en immunogeniciteit tegen SARS-CoV-2 na revaccinatie met Spikevax in kleine doses en met behulp van een huid patch | 
 
 
 | 
| E.2.2 | Secondary objectives of the trial  | 
| cellular immunity (B-cell and IGRA) after revaccination with Spikevax in fractional doses | 
 
| cellulaire immuniteit (B-cel en IGRA) na revaccinatie met Spikevax in kleinere doses | 
 
 
 | 
| E.2.3 | Trial contains a sub-study  |  No  | 
| E.3 | Principal inclusion criteria  | 
age 18-40 primary vaccination series with Comirnaty healthy not immunocompromised not pregnant | 
 
leeftijd 18-40 primaire vaccinatie serie met Comirnaty gezond niet immuungecompromitteerd niet zwanger 
 | 
 
 
 | 
| E.4 | Principal exclusion criteria | 
having had covid-19 (anti-N and PCR) having received a covid-19 booster use of corticosteroids (systemic of topical) use of other immunesuppressants | 
 
doorgemaakte covid-19 (anti-N en PCR) eerder een covid-19 booster gehad gebruik van corticosteroïden (systemisch of topical) gebruik van ander immuunsuppresiva | 
 
 
 | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
- Safety of intradermal vaccination with ceramic skin patch with Spikevax, compared to a similar dose intramuscularly - Antibody response after intradermal vaccination with ceramic skin patch with Spikevax, compared to a similar dose intramuscularly | 
 
- veiligheid van intradermale vaccinatie van Spikevax met behulp van een keramische huid patch, vergeleken met dezelfde dosis intramusculair toegediend - antistofrespons na intradermale vaccinatie van Spikevax met behulp van een keramische huid patch, vergeleken met dezelfde dosis intramusculair toegediend | 
 
 
 | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
Dx = screening for eligibility D1 = vaccination D15 = adverse event diary, immune response monitoring D29 = immune response monitoring M6 = final contact for SAE | 
 
Dx = screening voor geschiktheid van deelname D1 = vaccinatie D15 = einde bijwerking dagboekje, immuunrespons monitoring D29 = immuunrespons monitoring M6 = laatste contact voor SAE | 
 
 
 | 
| E.5.2 | Secondary end point(s) | 
| cellular immunity (B-cell and IGRA) after revaccination with Spikevax in fractional doses | 
 
| cellulaire immuniteit (B-cel en IGRA) na revaccinatie met Spikevax in kleinere doses | 
 
 
 | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
D1 = vaccination D29 = immune response monitoring | 
 
D1 = vaccinatie D29 = immuunrespons monitoring | 
 
 
 | 
| 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 |  Yes  | 
| E.6.5 | Efficacy |  Yes  | 
| E.6.6 | Pharmacokinetic |  No  | 
| E.6.7 | Pharmacodynamic |  No  | 
| E.6.8 | Bioequivalence |  No  | 
| E.6.9 | Dose response |  Yes  | 
| 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) |  Yes  | 
| E.7.3 | Therapeutic confirmatory (Phase III) |  No  | 
| E.7.4 | Therapeutic use (Phase IV) |  No  | 
| E.8 Design of the trial | 
| E.8.1 | Controlled |  Yes  | 
| E.8.1.1 | Randomised |  Yes  | 
| E.8.1.2 | Open |  Yes  | 
| E.8.1.3 | Single blind |  No  | 
| E.8.1.4 | Double blind  |  No  | 
| E.8.1.5 | Parallel group |  Yes  | 
| E.8.1.6 | Cross over  |  No  | 
| E.8.1.7 | Other |  No  | 
| E.8.2 |  Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) |  Yes  | 
| E.8.2.2 | Placebo  |  No  | 
| E.8.2.3 | Other |  No  | 
| E.8.2.3.1 | Comparator description | 
| Spikevax - mRNA-1273 vaccine | 
 
| Spikevax - mRNA-1273 vaccine | 
 
 
 | 
| E.8.2.4 | Number of treatment arms in the trial | 2 | 
| E.8.3 | 
                                The trial involves single site in the Member State concerned
                             |  Yes  | 
| E.8.4 |  The trial involves multiple sites in the Member State concerned  |  No  | 
| 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 |  Yes  | 
| 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
                     | 
 | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years |  | 
| E.8.9.1 | In the Member State concerned months | 9 | 
| E.8.9.1 | In the Member State concerned days |  |