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NCT Number: NCT07781501

Long-Term Study of COVID-19 Infection and Long COVID

This study will examine how common Long COVID is and how symptoms may persist over time in people who have previously had COVID-19. Researchers will collect information about participants' health and symptoms through questionnaires and may collect saliva and other non-invasive oral samples. The study will also examine biological factors in these samples that may be associated with persistent symptoms. The goal is to better understand why some people develop Long COVID and identify factors that may help predict who is more likely to experience persistent symptoms.

Recruiting

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Key information

Age range

18 year–75 year

Sex eligibility

All sexes

Study type

Observational

Primary location

University of North Carolina

Chapel Hill, North Carolina, 27599-7555, United States

Location status: Recruiting

Location contact

Jeannene L Matthews, MA, M.Ed., CCC-SLP

CONTACT

[email protected]

+1 919-537-5999

Laura A Jacox, PhD, DMD, MS

CONTACT

[email protected]

+1 847-702-0988

Laura A Jacox, PhD, DMD, MS

PRINCIPAL_INVESTIGATOR

About this study

Post-Acute Sequelae of COVID-19 (PASC), also known as Long COVID, is characterized by persistent or newly developed symptoms following SARS-CoV-2 infection. The biological mechanisms underlying persistent symptoms remain incompletely understood, particularly among individuals experiencing symptoms more than two years after infection.

This observational study will evaluate individuals with a history of SARS-CoV-2 infection to characterize the prevalence, severity, and persistence of PASC symptoms and identify demographic, clinical, and biological factors associated with these outcomes. Participants will complete questionnaires about their health and symptoms and provide saliva specimens for biological analyses.

Saliva will be evaluated for biological factors that may be associated with persistent symptoms, including proteins, metabolites, microorganisms, and immune-related markers.

Machine learning approaches will be used to integrate demographic, clinical, symptom, and saliva-based biological data to identify patterns associated with PASC. The study will evaluate whether these combined characteristics can be used to identify individuals who are more likely to experience persistent or severe symptoms following SARS-CoV-2 infection. The resulting models may help identify factors that contribute to Long COVID risk and inform future approaches for predicting persistent symptoms.

The study will include both newly enrolled participants and participants who previously participated in related SARS-CoV-2 research. Findings from this study may improve understanding of Long COVID and the factors associated with persistent symptoms following SARS-CoV-2 infection.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Age 18 to 75 years.
  • Previous laboratory-confirmed SARS-CoV-2 infection.
  • Willing and able to provide informed consent.
  • Able to complete study questionnaires and study procedures.

Exclusion criteria

  • Current severe periodontal disease with bleeding gums.
  • Current oral herpes flare, aphthous ulcer, or oral candidiasis (thrush).
  • Oral viral or bacterial infection within the previous 30 days.
  • Dry mouth that would prevent adequate saliva collection.
  • Active alcohol or drug abuse.
  • Medical or genetic syndrome or developmental delay that would prevent completion of study procedures or questionnaires.

Treatment and study plan

This study is observational. Only patients who have previously tested positive for SARS-CoV-2 infection or are experiencing ongoing symptoms.

Other

Other:

Primary outcomes

  1. Salivary Proteomic Profile

    Time frame: During active infection through three months post infection

    Unbiased and untargeted mass spectrometric analysis of saliva proteins to obtain a specific proteomic profile

  2. Salivary Metabolomic Profile

    Time frame: During active infection through three months post infection

    Unbiased and untargeted mass spectrometric analysis of saliva metabolites to obtain a specific metabolomic profile

  3. Validated Health Questionnaires: SBQ-LC (Symptom Burden Questionnaire - Long COVID)

    Time frame: During active infection through three months post infection

    This instrument assesses PASC-related symptom burden following COVID-19 infection.

    Scoring: 0- None, 1- Mild, 2- Moderate, 3-Severe - Higher score reflects greater severity.

  4. Validated Health Questionnaire: C19-YRS (COVID-19 Yorkshire Rehabilitation Scale)

    Time frame: During active infection through three months post infection

    This instrument assesses the long-term physical, cognitive, and psychological outcomes following COVID-19 infection.

    Scoring: 0-10 numerical scale; a higher score reflects greater severity.

  5. Validated Health Questionnaire: EFTER-COVID survey

    Time frame: During active infection through three months post infection

    This instrument assesses the long-term physical, cognitive, and psychological outcomes following COVID-19 infection. EFTER is not an abbreviation; it is the name of the survey, and it is the Danish word for "After"

    Scoring: Yes/No - Higher score reflects More affected.

Study contacts

Contact information is provided by the study sponsor or research team.

Jeannene L Matthews, MA, M.Ed., CCC-SLP

CONTACT

[email protected]

+1 919-357-5999

Laura A Jacox, PhD, DMD, MS

CONTACT

[email protected]

+1 847-702-0988

Sponsors and collaborators

Lead sponsor

University of North Carolina, Chapel Hill

Other

Collaborators

  • National Institute of Dental and Craniofacial Research (NIDCR)

Registry information

Official study title

Longitudinal Study of Patients With Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Infection and Post-Acute Sequelae of COVID-19 (PASC)

Acronym: PASC

Important dates

Study start
2024
Primary completion
2028
Study completion
2029
First posted
Aug 24, 2026
Registry last updated
Aug 24, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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