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Table 1 Characteristics of TB cases identified under different technical instruction

From: USA’s expanded overseas tuberculosis screening program: a retrospective study in China

Characteristics CDOT TB TI (n) 1991 TI (n)
TB cases identified 270 131
 Male sex 176 88
Age group, y   
 ≤24 26 15
 25–34 37 20
 35–44 35 16
 45–54 60 26
 55–64 63 30
 65–74 33 20
 ≥75 16 4
Medical history investigation   
 TB now, on treatment 12 12
 TB previous, treated 33 20
 TB previous, untreated 8 0
 TB previous suspect classification, untreated 5 2
 Current TB symptoms 40§ 19
Chest radiograph characteristics   
 Consistent with inactive TB 22 3
 Consistent with active TB 248 128
Sputum test   
 Positive AFB smear and MTB culture 41 40
 Positive AFB smear and negative MTB culture 10 10
 Negative AFB smear and positive MTB culture 181 44
Negative AFB smear and negative MTB culture 32 31
 Nontuberculous mycobacteria 6* 6
Drug susceptibility test for MTB isolates   
 Total isolates 222 84
 Pan-susceptible to first-line anti-TB drugs 184 71
 First-line primary-drug resistant 33 11
 First-line acquired-drug resistant 5 2
 Multidrug resistant 5 2
  1. Abbreviations: AFB = acid fast bacilli, CDOT TB TI Technical Instructions for Tuberculosis Screening and Treatment Using Cultures and Directly Observed Therapy (2009), MTB = Mycobacterium tuberculosis,TB = tuberculosis, 1991 TI = Technical Instructions for Tuberculosis Screening and Treatment (1991).
  2. Notes: §two persons were currently on treatment; *one with negative AFB smear, four cases of primary and one case of acquired multidrug resistance.