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Table 1 Results from routine testing of patients with risk factors for M. tuberculosis infection using a PPD-based whole blood interferon-γ release assay (IGRA), stratified by testing site. San Francisco, November 2003 – February 2005

From: Feasibility, acceptability, and cost of tuberculosis testing by whole-blood interferon-gamma assay

 

Homeless Clinics (n = 2)

TB Clinic

Immigrant & Refugee (n = 2)

Methadone Clinic

Total

IGRA Result

n (%)

n (%)

n (%)

n (%)

N (%)

Positive

411 (16)

213 (33)

164 (34)

31 (17)

819 (21)

Negative

2148 (82)

419 (64)

303 (63)

140 (76)

3010 (77)

Indeterminate

41 (2)

21 (3)

14 (3)

13 (7)

89 (2)

Total tested

2600

642

481

184

3918