Table 1.

Number of pertussis cases per season

	First winter	Second winter
	Season 2008–2009 (n = 209 )	Season 2009–2010 (n = 373 )
Clinical suspicion of pertussis
Clinical suspicion of pertussis (%)	22/209 (10,5)	49/373 (13,1)
Prospective PCR B, pertussis positive n/N (%)	2/22 (9,1)	7/49 (14,3)
No clinical suspicion of pertussis
No clinical suspicion of pertussis (%)	187/209(89,5)	324/373 (86,9)
Material for retrospective PCR	0/187 (0,0)	257/324 (79,3)
Retrospective PCR B. pertussis positive, n/N (%)	NA	7/257 (2,7)
Total number of Pertussis cases, n/N (%)	2/209 (1,0)	14/373 (3,8)

NA: not applicable.