Table. Characteristics of Participants With RT-PCR–Confirmed SARS-CoV-2 Infection Who Completed at Least 1 Home Antigen Test.
| Characteristic | Participants, No. (%)a |
|---|---|
| No. | 225 |
| Age, median (range), y | 29 (1-83) |
| Age group, y | |
| <12 | 39 (17) |
| 12-17 | 41 (18) |
| 18-49 | 119 (53) |
| ≥50 | 26 (12) |
| Sex | |
| Female | 117 (52) |
| Male | 108 (48) |
| Race and ethnicityb | |
| Hispanic or Latino, any race | 50 (22) |
| Non-Hispanic | |
| American Indian or Alaska Native | 0 |
| Asian | 10 (4) |
| Black or African American | 6 (3) |
| Native Hawaiian or Other Pacific Islander | 3 (1) |
| White | 145 (64) |
| Multiracial | 11 (5) |
| Symptomaticc | 205 (91) |
| COVID-19 vaccination statusd | |
| Not vaccinated | 194 (86) |
| Received at least 1 vaccine dose | 31 (14) |
| SARS-CoV-2 lineagee | |
| B.1.1.7 (Alpha) | 126 (56) |
| B.1.427 or B.1.429 (Epsilon) | 35 (16) |
| P.1 (Gamma) | 8 (4) |
| Other lineages | 39 (17) |
| Unknown | 17 (8) |
Abbreviations: NP, nasopharyngeal; RT-PCR, reverse transcription-polymerase chain reaction.
Percentages may not add to 100% owing to rounding.
Self-reported by participants; responses were categorized by investigators following federal government standards.9
Participants were considered symptomatic if they reported symptoms that fulfilled the clinical criteria for COVID-19 adopted by the Council of State and Territorial Epidemiologists on August 5, 2020 (https://ndc.services.cdc.gov/case-definitions/coronavirus-disease-2019-2020-08-05/). Symptoms were captured via the enrollment questionnaire and daily symptom questionnaires during the 15-day enrollment period.
Vaccination status was assigned at the start of the infectious period of the case. If the case was symptomatic, the start of the infectious period was 2 days before symptom onset; if asymptomatic, it was the collection date of the first positive SARS-CoV-2 RT-PCR test result.
Forty-two individuals did not have an NP specimen that was able to be sequenced. Of these 42 individuals, 25 (60%) lived with a household member who had an NP specimen that was successfully sequenced; we assumed that these individuals were infected with the same SARS-CoV-2 lineage as their household members. Seventeen individuals (40%) did not have a household contact with a successfully sequenced specimen and were categorized as unknown. No enrolled households had more than 1 lineage detected.