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Attenuation of COVID-19 Caused by SARS-CoV-2 B.1.617.2 (Delta) Variant with the Inactivated Vaccines: A Retrospective Cohort Study

Attenuation of COVID-19 Caused by SARS-CoV-2 B.1.617.2 (Delta) Variant with the Inactivated Vaccines: A Retrospective Cohort Study

Status
Active, not recruiting
Phases
Unknown
Study type
Observational
Source
ChiCTR
Registry ID
ChiCTR2200060714
Enrollment
Unknown
Registered
2022-06-09
Start date
2022-05-31
Completion date
Unknown
Last updated
2024-06-03

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

Conditions

COVID-19

Interventions

Group A:unvaccinated
Group B:partially vaccinated
Group C:fully vaccinated

Sponsors

Guangdong Provincial Hospital of Chinese Medicine
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: All RT-PCR-confirmed COVID-19 patients infected with the Delta variant.

Exclusion criteria

Exclusion criteria: 1. Be vaccinated with noninvaccinated vaccines; 2. Aged < 18 years; 3. Be boosted vaccinated; 4. Those with incomplete information associated with clinical outcome.

Design outcomes

Primary

MeasureTime frame
the proportion of severe disease;—

Secondary

MeasureTime frame
the duration of viral shedding;highest temperature;—

Countries

China

Contacts

Public ContactZhang Zhongde

The Second Affiliated Hospital of Guangzhou University of Chinese Medicine

doctorzzd99@163.com+86 18602010082

Outcome results

None listed

Source: ChiCTR (via WHO ICTRP) · Data processed: Feb 4, 2026