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Efficacy, safety and antibody response of sixth dose of COVID-19 vaccination in healthcare workers

Efficacy, safety and antibody response of sixth dose of COVID-19 vaccination in healthcare workers - Efficacy, safety and antibody response of sixth dose of COVID-19 vaccination in healthcare workers

Status
Active, not recruiting
Phases
Unknown
Study type
Interventional
Source
JPRN
Registry ID
JPRN-UMIN000051510
Enrollment
400
Registered
2023-07-05
Start date
2023-07-04
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 individual

Interventions

Sponsors

Chiba University Hospital
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: Healthcare workers at Chiba University School of Medicine Hospital who is eligible for vaccination at our hospital as the sixth opportunity, including people in the fourth, fifth, and sixth rounds who can receive vaccination at our hospital. A person who has received sufficient explanation for participation in this study and has obtained written consent from the patient himself/herself based on sufficient understanding.

Exclusion criteria

Exclusion criteria: those who are unable to use the vaccine at this time due to contraindications or other reasons. those who have been deemed unsuitable as subjects by the principal investigator or co-investigator.

Design outcomes

Primary

MeasureTime frame
Antibody titer before and after the 6th vaccination.

Secondary

MeasureTime frame
Adverse reactions due to the 6th vaccination. Serum prevalence rate and prevalence rate of previously undiagnosed patients. Preventive effect against onset. The effect of hybrid immunity due to previous infection and vaccination on preventive effect against onset and antibody levels. Relationship between the antibody titer this time and the antibody

Countries

Japan

Contacts

Public ContactMisuzu Yahaba

Chiba University Hospital Department of Infection Control

m_yahaba@chiba-u.jp0432227171

Outcome results

None listed

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