Pattern of antibody response after 3rd dose of COVID-19 vaccine booster among healthy volunteers.

Status

Active, not recruiting

Phases

Unknown

Study type

Observational

Source

TCTR

Registry ID

TCTR20210831002

Enrollment

180

Registered

2021-08-31

Start date

2021-08-01

Completion date

Unknown

Last updated

2026-08-03

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

Conditions

Healthy volunteer COVID-19 Vaccines administration and dosage immunology

Interventions

healthy volunteers previous received 2 doses of Sinovac and 3rd dose of AstraZeneca Covid vaccine,healthy volunteers previous received 2 doses of Sinovac and 3rd dose of Pfizer Covid vaccine

Prevention,Prevention

viral vector group,mRNA group

Eligibility

Sex/Gender

All

Age

30 Years to 60 Years

Inclusion criteria

Inclusion criteria: healthy volunteer

Exclusion criteria

Exclusion criteria: 1.Diabetes 2. CKD 3. immune deficiency status 4. taking immune modulator drugs 5. obesity with BMI over 35 or BW > 100 kg.6. cancer 7. pregnant 8. lactaing women 9. postpartum women 10. has been diagnosed of Covid-19 infection 11. taking prednisolone > 20 mg/day within 1 months

Design outcomes

Primary

Measure	Time frame
level of neutralizing antibody at 1, 6 and 12 months metric measurement	—

Secondary

Measure	Time frame
anti RBD titer 1,6,12 months ECLIA	—

Countries

Thailand

Contacts

Public ContactSuparat Kanjanavanit

Nakornping Hospital

skanjanavanit@gmail.com0896375704

Outcome results

None listed

Source: TCTR (via WHO ICTRP) · Data processed: Aug 9, 2026