Volume 8, Number 11—November 2002
THEME ISSUE
Tuberculosis Genotyping

Tuberculosis Genotyping Network, United States

Genotyping Analyses of Tuberculosis Cases in U.S.- and Foreign-Born Massachusetts Residents

Sharon Sharnprapai* , Ann C. Miller*, Robert Suruki*, Edward Corkren*, Sue Etkind*, Jeffrey Driscoll†, Michael McGarry†, and Edward Nardell*‡

Author affiliations: *Massachusetts Department of Public Health, Boston, Massachusetts, USA; †New York State Department of Health, Wadsworth Center, Albany, New York, USA; ‡Harvard Medical School, Boston, Massachusetts, USA;

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Table 5

Epidemiologic connection among clustered tuberculosis (TB) cases in Cluster Investigation Study, 1998–2000

Cluster contains	Overall (%)a			Many (>6 copies of IS6110) (%)			Few (≤6 copies of IS6110) (%)
	No. Cases	Definite/possible	Unlikely	No. Cases	Definite/possible	Unlikely	No. Cases	Definite/possible	Unlikely
U.S.-born only	42	26 (62)	16 (38)	33	26(79)	7(21)	9	0	9 (100)
U.S.-born and foreign-born	67	28 (42)	39 (58)	30	19 (63)	11 (37)	37	9 (24)	28 (76)
Foreign-born only	43	14 (33)	29 (67)	27	12 (44)	15 (56)	16	2 (13)	14 (87)
Total	152	68 (45)	84 (55)	90	57 (63)	33 (37)	62	11 (18)	51 (82)

^a%, epidemiologic link.

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