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Efficacy and Safety of the fourth dose of mRNA COVID-19 Vaccine in healthy volunteers: An observational study.

Efficacy and Safety of the fourth dose of mRNA COVID-19 Vaccine in healthy volunteers: An observational study. - COVID-19 Vaccine 4th study

Status
Active, not recruiting
Phases
Unknown
Study type
Observational
Source
JPRN
Registry ID
JPRN-UMIN000048653
Enrollment
25
Registered
2022-08-12
Start date
2022-08-08
Completion date
Unknown
Last updated
2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Healthy Volunteers

Interventions

None listed

Sponsors

Kobe City Medical Center General Hospital
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: 1) Healthy adults who, at the time of study participation, have no history or comorbidity requiring ongoing medication or treatment, or who have a history of chronic disease but whose condition is stable and who have not required a change in treatment or hospitalization within the past 6 weeks 2) Willing to receive the SARS-CoV-2 vaccination initiated by the Japanese government or local authorities. 3) Have given written consent to participate in the study.

Exclusion criteria

Exclusion criteria: 1) Those deemed inappropriate for participation in the study by the investigator 2) Patients with a history of or coexisting with immunosuppressive medication, autoimmune diseases (systemic lupus erythematosus, Sjogren's syndrome, dermatomyositis/polymyositis, mixed connective tissue disease, systemic scleroderma, rheumatoid arthritis, polymyalgia rheumatica, psoriatic arthritis, spondyloarthritis and its related diseases, vasculitis syndrome, inflammatory bowel disease, Guillain-Barre syndrome, neuromyelitis optica) Multiple sclerosis, neuromyelitis optica). 3) Patients with a history of COVID-19 4) Inability to communicate

Design outcomes

Primary

MeasureTime frame
The primary endpoint was the rate of positivity for SARS-CoV-2 IgG antibodies.

Secondary

MeasureTime frame
Secondary endpoints will be SARS-CoV-2 IgG antibody titer, T-cell immune response, peripheral blood lymphocyte fraction, IgG, IgA, IgM, and presence and content of post vaccination adverse reactions.

Countries

Japan

Contacts

Public ContactMasashi Nishikubo

Kobe City Medical Center General Hospital Department of Hematology

masashi_nishikubo@kcho.jp0783024321

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026