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Table 1 Cohort 1 comprising all respiratory tract isolates (n = 177). The distribution of clinical and laboratory characteristics per study year

From: Differential distribution of IgA-protease genotypes in mucosal and invasive isolates of Haemophilus influenzae in Sweden

Culture year 2010 2011 2012 Total
Number of isolates 43 52 82 177
igaA1, n (%) 31 (72%) 39 (75%) 51 (62%) 121 (68%)
igaA1 alone, n (%) 14 (33%) 29 (56%) 20 (24%) 63 (36%)
igaA2a, n (%) 12 (28%) 13 (25%) 30 (37%) 55 (31%)
igaB1a, n (%) 23 (53%) 15 (29%) 43 (52%) 81 (46%)
igaB2, n (%) 0 0 1 (1.2%) 1 (0.6%)
Age (years), mean (median) 24 (6) 32 (36) 29 (34) 29 (32)
Gender, % female 53% 67% 55% 58%
Primary care referrals, n (%) 31 (72%) 33 (63%) 55 (67%) 119 (67%)
Acute otitis media, n (%) 10 (24%) 8 (15%) 15 (18%) 33 (19%)
Sinusitis, n (%) 5 (12%) 5 (10%) 11 (13%) 21 (12%)
Upper respiratory tract infection, n (%) 17 (41%) 21 (40%) 18 (22%) 56 (32%)
Lower respiratory tract infection, n (%) 7 (17%) 8 (15%) 12 (15%) 27 (15%)
Unclear diagnosis from referral, n (%) 2 (5%) 10 (19%) 26 (32%) 38 (22%)
  1. aSome isolates have both the igaA and igaB gene, resulting in a total percentage of > 100%