Abstract S50

Clinical diagnosisnT SPOT positive, n = 75 (6)T SPOT negative, n = 63 (14)TST positiveTST negative
The numbers in brackets refer to specimens that were not processed according to the protocol (stored overnight or frozen before testing).
*Sputum from one patient grew both M avium and M xenopi.
†This test result was subsequently reviewed by OI and reported as borderline positive.
‡These patients were aged 31, 33, and 38 years; one was an intravenous drug abuser; one had an isoniazid resistant strain; none had HIV co-infection.
Microscopy +, TB cultured2318 (2)1† (2‡)10
Microscopy −, TB cultured119 (1)0 (1‡)50
Microscopy +, culture −, TB Rx10100
Granulomata on biopsy & TB Rx42 (1)130
Microscopy −, culture −, TB Rx1686 (2)56
Microscopy −, culture −, no TB Rx5417 (2)32 (3)211
Atypical mycobacteria*623 (1)01
M gordonae 11000
M avium 20200
M fortuitum 100 (1)01
M xenopi 31200
Firm alternative diagnosis16212 (2)13
    Malignancy513 (1)11
    Sarcoidosis816 (1)02
    Other30300
Culture pending/contaminated27177 (3)44