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Table 1 Estimated infectious pool of TB in West Gojjam Zone of Amhara Region, Ethiopia from October 2013 to October 2014

From: Applying tuberculosis management time to measure the tuberculosis infectious pool at a local level in Ethiopia

Category of TB cases PTB patients attended at the study sites during the study period (one year) Infectious period in days Total estimated infectious person days in a year
Number Percent (%)
New registered PTB cases (n = 706)
 Smear-positive 334 47.3 75 25,050
 Smear-negative 372 52.7   
 Smear-negative culture positive 193c 27.3 67 12,931
Retreatment registered cases (n = 72)
 Failure 10 13.9 293 2930
 Default 8 11.1 192 1536
 Relapse 54 75.0 81 4374
Not registered cases
 Undiagnosed cases 94b 28.1 365 34,310
Total     a 81,131
  1. aTotal estimated infectious person days per 100,000 population per year is 3405
  2. bWe assumed 28% of smear-positive cases were undiagnosed based on the national TB prevalence survey report [14]
  3. cAmong a cohort of smear-negative cases enrolled in the study, 52% of smear- negative cases were estimated to be culture positive
  4. TB tuberculosis
  5. PTB Pulmonary tuberculosis