Skip to content

Safety, tolerability, and antibody response after intradermal vaccination of COVID-19 vaccine; PFE-BNT in adults who have completed two-doses of Verocell (inactivated vaccine)

Safety, tolerability, and antibody response after intradermal vaccination of COVID-19 vaccine; PFE-BNT in adults who have completed two-doses of Verocell (inactivated vaccine)

Status
Active, not recruiting
Phases
Phase 4
Study type
Interventional
Source
TCTR
Registry ID
TCTR20211023002
Enrollment
40
Registered
2021-10-23
Start date
2021-08-20
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

Local reactions and systemic reactions after ID injection of PFE-BNT , antibody response after ID injection of PFE-BNT immunogenicity side effects

Interventions

PFE-BNT was prepared under the recommendation of department of disease control, Thailand. Sterile 0.9% of Nacl 1.8 ml is added into PFE-BNT vaccine vial as a diluent. After diluting, each vial contain
Experimental Drug
PFE-BNT Indradermal injection

Sponsors

Lampang Hospital
Lead Sponsor

Eligibility

Sex/Gender
All
Age
18 Years to No maximum

Inclusion criteria

Inclusion criteria: participants were adults aged more than 18 years who completed 2 doses of a three-week schedule of Verocell, and have not had SARS-CoV-2 infection.

Exclusion criteria

Exclusion criteria: Participants were excluded from the study if they: had history of severe adverse or allergic reactions to previous vaccinations, were pregnancy or planned pregnancy within 4 weeks after vaccination, used of systemic or topical corticosteroids, had bleeding diathesis , received other Covid-19 vaccine, and had SARS-CoV-2 infection before collecting post ID injection blood sample.

Design outcomes

Primary

MeasureTime frame
Safety and tolerability immediate, 30 minutes, day 1, day 7, and day 30 Direct observe , Vaccine side effect report form

Secondary

MeasureTime frame
Antibody response Before receiving ID injection, at day 30 after ID injection immunoglobulin class G (IgG) antibodies to the receptor binding domain (RBD) of the S1 subunit of the spike protein of SARS-CoV-2.

Countries

Thailand

Contacts

Public ContactWachiraporn Arunothong

Lampang Hospital

wachira_arun@yahoo.com66865867912

Outcome results

None listed

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