A Longitudinal Study of COVID-19 Positive Patients Testing Nasal Swabs and Collecting Blood Samples for Research
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The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. |
ClinicalTrials.gov Identifier: NCT04327804 |
Recruitment Status :
Completed
First Posted : March 31, 2020
Last Update Posted : April 11, 2022
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Minimal risk research study:
- Comparing polyester nasal swabs and foam nasal swabs to detect SARS-CoV-2 virus;
- Quantifying the development and trajectory of the disease through clinic visits and blood values.
Condition or disease | Intervention/treatment |
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SARS-CoV Infection | Diagnostic Test: Odd/Even birth year intervention groups |
This work will serve both the Everett Clinic and broader UnitedHealth Group patient populations as well as advance the public health emergency response to the community spread of SARS-CoV-2 virus, especially as the number of cases and deaths continues to rise in many geographies. A recent study conducted at The Everett Clinic showed that foam nasal swabs were able to detect SARS-CoV-2 virus at comparable levels to nasopharyngeal (NP) swabs. We now look to build off this work by comparing polyester foam swabs, which are more readily available and mass producible, to foam nasal swabs, in their sensitivity for detecting SARS-CoV-2 virus. We also plan to assess the viability of dry swabbing, where the swab is stored without saline or viral transport media (VTM) at room temperature for four days, to calculate the degradation of the viral sample.
Finally, we will collect up to 50 mL/visit of blood longitudinally from patients who have previously tested positive for SARS-CoV-2 at visit one, two, and four weeks following their initial COVID-10 diagnosis.The medical professional drawing the blood will determine if the patient is at an increased risk from a blood draw due to underlying conditions such as anemia. In these cases, the amount of blood drawn will be left to the discretion of the medical professional but shall not surpass 10 mL per visit.These longitudinal blood samples will help us gain a better understanding of the trajectory of COVID-19 (in terms of both clinical symptomology and viral load) and antibody development. At each visit, nasal swabs and blood samples will be collected, and the blood samples will be stored in a repository for future research.
Study Type : | Observational |
Actual Enrollment : | 139 participants |
Observational Model: | Case-Only |
Time Perspective: | Prospective |
Official Title: | A Longitudinal Study of COVID-19 Positive Patients Testing Nasal Swabs and Collecting Blood Samples for Research |
Actual Study Start Date : | March 25, 2020 |
Actual Primary Completion Date : | August 18, 2020 |
Actual Study Completion Date : | October 10, 2020 |

Group/Cohort | Intervention/treatment |
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Odd numbered birth year
The collection of patient samples will be different as defined by odd/even birth year. Patients born in an odd numbered year will first have their left nostril swabbed by the foam swab followed by their right nostril being swabbed by the two polyester swabs.
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Diagnostic Test: Odd/Even birth year intervention groups
The nostril used and order of testing will be different in each arm. |
Even numbered birth year
The collection of patient samples will be different as defined by odd/even birth year. Patients born in an even numbered year will first have their left nostril swabbed by the two polyester swabs followed by their right nostril being swabbed by a foam swab.
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Diagnostic Test: Odd/Even birth year intervention groups
The nostril used and order of testing will be different in each arm. |
- Detection of SARS-CoV-2 virus [ Time Frame: 42 days ]Measure the agreement between the detection of SARS-CoV-2 virus using a foam nasal swab tested directly after collection, a polyester nasal swab tested directly after testing, and a polyester nasal swab stored at room temperature for four days without saline or VTM before being tested.
- Trajectory of COVID-19 and antibody development [ Time Frame: 2 months ]Longitudinal blood samples from SARS-CoV-2 patients to gain a better understanding of the trajectory of COVID-19 and antibody development
Biospecimen Retention: Samples Without DNA
Patients will return at the following times to complete the same battery of sample collection:
- 7-9 days after initially testing positive;
- 14-18 days after initially testing positive;
- 28-42 days after initially testing positive. Additional visits, during which additional samples could be collected may occur after 42 days if agreeable to the participants and desired by the study investigators.

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.
Ages Eligible for Study: | Child, Adult, Older Adult |
Sexes Eligible for Study: | All |
Sampling Method: | Non-Probability Sample |
Inclusion Criteria:
- Existing patient of the Everett Clinic (i.e., has previously sought care)
- Tested positive for SARS-CoV-2 virus (confirmed by RT-PCR) prior to time of enrollment
Exclusion Criteria:
- Not able to demonstrate understanding of the study
- Not able to safely travel to the clinic without endangering themselves or risking exposing others to SARS-CoV-2
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Medical history evidencing any of the following
- Active nosebleed in the past 24 hours
- Nasal surgery in the past two weeks
- Chemotherapy treatment with low platelet and low white blood cell counts
- Acute facial trauma
- Advanced COVID-19 state that would preclude safe and feasible sample collection

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04327804
United States, Washington | |
Everett Clinic | |
Seattle, Washington, United States, 98133 |
Principal Investigator: | Ethan Berke | UnitedHealth Group Research & Development | |
Principal Investigator: | Yuan Tu | OptumCare, Everett Clinic |
Responsible Party: | UnitedHealth Group |
ClinicalTrials.gov Identifier: | NCT04327804 |
Other Study ID Numbers: |
20-002 |
First Posted: | March 31, 2020 Key Record Dates |
Last Update Posted: | April 11, 2022 |
Last Verified: | April 2022 |
Individual Participant Data (IPD) Sharing Statement: | |
Plan to Share IPD: | Yes |
Plan Description: | Four data sources will be recorded for each patient who consents to participate in the study:
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Supporting Materials: |
Study Protocol Statistical Analysis Plan (SAP) Informed Consent Form (ICF) |
Time Frame: | 2 months |
Access Criteria: | The data collected due to this study will be extracted from the medical record and stored for additional research analysis to demonstrate equivalence between location in the two nasal swabs. Blood samples will be delivered to PATH and the Mayo Clinic for storage and analysis. Patients may not have access to these samples or the blood features derived from them after sample collection. Data will be shared between the participating clinics, UHG and collaborating partners performing the analysis of the samples and returning results. |
Studies a U.S. FDA-regulated Drug Product: | No |
Studies a U.S. FDA-regulated Device Product: | No |
Severe Acute Respiratory Syndrome Respiratory Tract Infections Infections Coronavirus Infections Coronaviridae Infections |
Nidovirales Infections RNA Virus Infections Virus Diseases Respiratory Tract Diseases |