TABLE 2.

Index case sputum smear grading in relation to genotype, as well as number of child contacts infected and/or diseased, in relation to index case sputum smear grading

Group	No. of cases with the following sputum smear gradinga:
	Sm−	Sm1+	Sm2+	Sm3+	Total
Genotype
Beijing	4	24	12	17	57
LAM	6	14	2	5	27
Haarlem	0	3	4	3	10
Xb	5	10	2	6	23
Otherc	0	8	4	10	22
Multipled	0	6	4	8	18
Total	15	65	28	50	157
Child contacts
Uninfected	17	33	18	33	101
Infected	2	49	23	44	118
Diseasede	0	16	6	12	34
Total	19	82	41	77	219

^aSmear grading reflects the highest grading recorded in any specimen collected from a particular individual or household. Sm−, smear negative; Sm1+ to Sm3+, smear-positive grades 1 to 3, respectively.

^bX, European clade of IS6110 low banders, as identified by spoligotyping.

^cOther, any genotype family with a frequency of less than 10 cases.

^dMultiple, households with multiple index cases or in which more than one genotype was identified in a single index case (mixed infection).

^eChildren with probable active TB represent a subgroup of those infected.