Table 1.

Transmission rate of tuberculosis from pediatric index cases[15,16-25]. n.a. = not available

Index case (age/smear)	Transmission rate to pediatric contacts n (%)	Transmission rate to adult contacts n (%)	Transmission rate to contacts n (%)	Reference
9 years Smear positive	n.a.	n.a.	56/27 (20%)	Curtis et al, 1999 [20]
7 years Smear positive	22/169 (13%)	19/49 (38,7%)	41/218 (18,8%)	Cardona et al, 1999 [21]
4 months Smear positive	0/44 (0%)	1/142 (0,7%)	1/186 (0,5%)	Ciofi degli atti et al, 2011 [25]
7 years Smear positive	1/16 (6,7%)	4/211 (1,9%)	5/227 (2,2%)	Lee et al, 2005 [22]
10 years n.a.	21/29 (72,4%)	n.a.	21/29 (72,4%)	Molicotti et al, 2008 [23]
16 years Smear positive	67/765 (8,7%)	0/172 (0%)	67/937 (7,1%)	Caley et al, 2010 [18]
9 years Smear negative	85/200 (42,5%)	n.a.	85/200 (42,5%)	Paranjothy et al, 2008 [19]
4 months Smear positive	n.a.	n.a.	17/525 (3,2%)	Reynolds et al, 2006 [24]
15 years Smear positive	58/559 (10,3%)	7/67 (10,4%)	65/626 (10,3%)	Phillips et al, 2004 [15]
13 years Smear positive	195/486 (40%)	12/40 (30%)	207/526 (39,3%)	Sacks et al, 1985 [16]
15 years Smear negative	20/52 (37,7%)	0/15 (0%)	20/67 (29,8%)	Baghaie et al, 2012 [17]