TABLE 1.

Annual incidence of pertussis in the Northwest Territories

	Number of pertussis cases
Year	Clinical	Epi-linked*	Laboratory- confirmed	Total	Rate per 10,000 population (CI)
1993	40	20	72	132	33.1 (27.4-38.7)
1994	0	1	4	5	1.2 (0.4-2.9)
1995	0	0	12	12	2.9 (1.5-5.1)
1996	0	2	35	37	8.9 (6.2-12.2)
1997	0	0	19	19	4.6 (2.7-7.1)
1998	0	0	14	14	3.4 (1.9-5.8)
1999	5	6	77	88	21.6 (17.4-26.7)
2000	0	0	8	8	2.0 (0.9-3.9)
2001	0	0	4	4	1.0 (0.3-2.5)
2002	0	0	13	13	3.1 (1.7-5.4)
2003	0	0	1	1	0.2 (0.0-1.3)
2004	0	0	1	1	0.2 (0.0-1.3)

^*Clinical case that has been in contact with a laboratory-confirmed case