Table 3.
Results of COVID-19 contact tracing for cases among people experiencing homelessness compared with cases among the general population, Salt Lake County, Utah, March–May 2020
| People experiencing homelessness | General population | P-value* | |||
| N | % | N | % | ||
| CASES | 169 | 163 | |||
| Interview outcome | |||||
| Interviewed | 93 | 55.0 | 163 | 100 | <.0001 |
| Not Interviewed-Unable to locate or contact | 73 | 43.2 | 0 | 0 | |
| Not Interviewed-Refused to participate | 3 | 1.8 | 0 | 0 | |
| Lost to follow-up (unable to locate at end of isolation) | |||||
| Yes | 24 | 14.2 | 0 | 0 | <.0001 |
| No | 145 | 85.8 | 163 | 100 | |
| Provided contacts | 20 | 11.8 | 153 | 93.9 | <.0001 |
| Did not provide contacts† | 149 | 88.2 | 10 | 6.1 | |
| Symptomatic, reported contacts‡ | 12 | 18.5 | – | – | .16 |
| Asymptomatic, reported contacts‡ | 6 | 9.7 | – | – | |
| CONTACTS | 50 | 758 | |||
| Contact Tracing Yield | |||||
| Number of contacts for each case: Median (Range) | 0 (0–7) | 4 (0–24) | <.0001 | ||
| Number of contacts per case§ | 0.3 | 4.7 | |||
| Contact is Family/Household member of case | |||||
| Yes | 16 | 32.0 | 444 | 58.6 | .01 |
| No | 34 | 68.0 | 314 | 41.4 | |
| Contacts experiencing homelessness | 19 | 38.0 | 3 | 0.4 | |
| Unable to reach (not enough contact information) | 13 | 26.0 | 54 | 7.1 | <.0001 |
| Testing | |||||
| Contacts tested | |||||
| Yes | 31 | 62.0 | 322 | 42.5 | <.0001 |
| No | 9 | 18.0 | 391 | 51.6 | |
| Unknown | 10 | 20.0 | 45 | 5.9 | |
| Percent SARS-CoV-2 test positivity among contacts who had testing done | |||||
| Positive | 8 | 25.8 | 167 | 51.9 | .006 |
| Symptomatic | 3 | 37.5 | 155 | 92.8 | <.0001 |
| Negative | 23 | 74.2 | 155 | 48.1 | |
| Percent positivity among total contacts | 8 | 16.0 | 167 | 22.0 | .3 |
P-value derived from a Χ2 (for categorical variables) and a Student's t-test (for continuous variables) in which PEH was compared to the general population comparison group.
Possible reasons for not reporting contacts include that the case was not interviewed, the individual did not feel comfortable reporting contacts, they did not know the contact's identifying information, or that they did not have any contacts to report.
Excluding unknown.
The number of contacts per case was calculated by dividing the number of contacts among PEH by the number of cases among PEH (n = 169) and the number of contacts among the general population by the number of cases among the general population (n = 163).