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

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

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
Category of TB cases	Number	Percent (%)	Infectious period in days	Total estimated infectious person days in a year
New registered PTB cases (n = 706)
Smear-positive	334	47.3	75	25,050
Smear-negative	372	52.7
Smear-negative culture positive	193^c	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	94^b	28.1	365	34,310
Total				^a 81,131

^aTotal estimated infectious person days per 100,000 population per year is 3405
^bWe assumed 28% of smear-positive cases were undiagnosed based on the national TB prevalence survey report [14]
^cAmong a cohort of smear-negative cases enrolled in the study, 52% of smear- negative cases were estimated to be culture positive
TB tuberculosis
PTB Pulmonary tuberculosis

ISSN: 2049-9957