A Clinical Trial to Evaluate the Immunogenicity and Safety of PPV23 Vaccine Revaccinations in the Elderly
Clinical trial NCT04701788 · COMPLETED
Trial details
- NCT number
- NCT04701788
- Sponsor
- China National Biotec Group Company Limited
- Status
- COMPLETED
- Phase
- Phase 4
- Study type
- INTERVENTIONAL
- Start date
- 2021-03-30
- Primary completion
- 2021-12-20
- Enrollment
- 331
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