Table 2.
Clinical characteristics of reported HIV cases by cluster status, Portland, OR metro area, 2018–2020
| No. (%) | Cluster case, No. (%) | Noncluster case, No. (%) | Chi-square (p-value) | |
|---|---|---|---|---|
| Total | 396 | 116 (29) | 280 (71) | |
| Exposure category | n/aa | |||
| MSM only | 251 (63) | 21 (18) | 230 (82) | |
| IDU only | 42 (11) | 40 (34) | 2 (1) | |
| MSM + IDU | 50 (13) | 49 (42) | 1 (< 1) | |
| Heterosexual contact with a person living with HIV/AIDS but no known risk | 12 (3) | 0 (0) | 12 (4) | |
| Heterosexual contact with MSM | 6 (2) | 1 (1) | 5 (2) | |
| Heterosexual contact with IDU | 6 (2) | 3 (3) | 3 (1) | |
| Adult with undetermined infection mode | 29 (7) | 2 (2) | 27(10) | |
| Stage at diagnosis | 1.9331 (0.1644) | |||
| HIV | 310 (78) | 96 (83) | 214 (76) | |
| AIDS | 86 (22) | 20 (17) | 66 (24) | |
| Hepatitis C statusb | ||||
| Unknown | 359 (91) | 90 (77) | 269 (96) | n/a (0.6720)e |
| Prior or concurrent with HIV Infection | 29 (7) | 21 (17) | 8 (3) | |
| After HIV infection | 8 (2) | 5 (4) | 3 (1) | |
| Earliest CD4+ T-cell (cells/μL) | 5.2829 (0.0713) | |||
| < 200 | 79 (20) | 16 (14) | 63 (22) | |
| ≥ 200 | 296 (74) | 91 (78) | 205 (73) | |
| No data | 21 (5) | 9 (8) | 12 (4) | |
| Result of most recent viral loadc,d | 15.6121 (0.0004) | |||
| < 200 copies/mL | 296 (74) | 73 (63) | 223 (80) | |
| ≥ 200 copies/mL | 18 (5) | 11 (9) | 7 (3) | |
| No data | 82 (21) | 32 (28) | 50 (18) | |
| Category of diagnosing providerc | 13.7189 (0.0082) | |||
| Outpatient | 221 (56) | 51 (44) | 170 (61) | |
| STD clinic or community testing site | 67 (17) | 22 (19) | 45 (16) | |
| Inpatient | 47 (12) | 18 (16) | 29 (10) | |
| Other | 11 (3) | 7 (6) | 4 (1) | |
| Missing or unknown | 50 (13) | 18 (16) | 32 (11) |
aTest not performed (exposure category was part of original case definition)
bConfirmed or presumptive case within 15 days or earlier from HIV diagnosis (prior or concurrent)
cSignificant difference in characteristic between cluster and noncluster HIV cases, Chi-square, p ≤ 0.05
dWithin 12 months. Reasons for no data could include death, moving out of jurisdiction, or out of care
eFisher’s exact test