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Texting study reveals how COVID-19 symptoms change day by day

NCT ID NCT04665245

Knowledge-focused Sponsor: University of Iowa Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study followed 214 people who tested positive for COVID-19. Participants received daily text messages asking about their symptoms, like fever, cough, and loss of taste or smell. The goal was to learn how symptoms develop and vary throughout the day, helping researchers better understand the course of the infection.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

214 people

The number who actually took part.

Started

Dec 2020

Finished

May 2021

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

The study population will include patients at the University of Iowa Hospitals \& Clinics (UIHC). Approximately 5,000 people have already tested positive for COVID-19 in Johnson County alone, and numbers are continuing to increase. The University of Iowa Hospitals \& Clinics see many patients from outside of Johnson County as well.

Ages

18 to 100 years

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Fluent in English * Tested positive for COVID-19 Exclusion Criteria: * Prisoners * Unable to provide own informed consent

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Conditions

The condition(s) this trial relates to.

COVID-19

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

COVID19

Contacts and locations

Locations

  • University of Iowa Hospitals & Clinics

    Iowa City, Iowa, 52242, United States

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Other studies related to the condition(s) this trial covers.