SARS-CoV-2 RNA shedding in recovered COVID-19 cases and the presence of antibodies against SARS-CoV-2 in recovered COVID-19 cases and contacts

The Prevalence of persistent viral shedding and antibody levels among recovered COVID-19 patients of the hospitals and Public Health Centers under Bangkok Metropolitan Administration

Status

Active, not recruiting

Phases

Unknown

Study type

Observational

Source

TCTR

Registry ID

TCTR20200708001

Enrollment

239

Registered

2020-07-08

Start date

2020-06-10

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

IgA and IgG antibodies of the recovered COVID&#45

Interventions

All COVID&#45

19 patients who treated and recovered at least 28 days after first symptoms.,High risk closed contact to COVID&#45

19 patients as department of disease control definition on March 3rd&#44

2020.

Screening,Screening

Recovery COVID&#45

19 patients,Closed contact to recovery COVID&#45

19 patients

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: Recovery COVID-19 patients 1. Thai nationality 2. Confirmed COVID-19 using realtime PCR from NP swab or throat swab 3. Recoveryed at least 28 days from first symptoms date 4. Living in Bangkok Closed contact to recovery COVID-19 patient 1. Thai nationality 2. High risk closed contact 3. Last contacted to COVID-19 patients not more than 6 months 4. Living in Bangkok

Exclusion criteria

Exclusion criteria: Any reasons that unable to draw blood .

Design outcomes

Primary

Measure	Time frame
Prevalence of persistent viral shedding and antibody levels among recovered COVID-19 patients at the beginning (more than 28-day after first symptoms) review records of NP swab for persistent viral shedding and serum for IgA and IgG antibody in COVID-,Prevalence of IgG antibody in closed-contact to COVID-19 patients at the beginning (more than 28-day after first symptoms) review records of serum for IgG antibody in closed-contact to COVID-19 patients	—

Measure

Time frame

Prevalence of persistent viral shedding and antibody levels among recovered COVID-19 patients at the beginning (more than 28-day after first symptoms) review records of NP swab for persistent viral shedding and serum for IgA and IgG antibody in COVID-,Prevalence of IgG antibody in closed-contact to COVID-19 patients at the beginning (more than 28-day after first symptoms) review records of serum for IgG antibody in closed-contact to COVID-19 patients

—

Secondary

Measure	Time frame
N/A N/A N/A	—

Countries

Thailand

Contacts

Public ContactPijaya Nagavajara

Bangkok Metropolitan Administration Bangkok City Hall

nagavajara@gmail.com022224959

Outcome results

None listed

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

SARS&#45;CoV&#45;2 RNA shedding in recovered COVID-19 cases and the presence of antibodies against SARS&#45;CoV&#45;2 in recovered COVID-19 cases and contacts