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Table 2 Incidence of bloodstream infection (BSI) in two time periods in an area of Mid-Norway. Number of episodes and observed and standardized incidence rates are shown

From: Burden of bloodstream infection in an area of Mid-Norway 2002-2013: a prospective population-based observational study

  2002–2007 2008–2013
Group of BSI n Observed
incidence ratea
(95% CI)
Age and sex
standardized
incidence
rateb
n Observed
incidence ratea
(95% CI)
Age and sex
standardized
incidence
rateb
All BSIs 921 221(206–235) 205 1074 242 (228–257) 223
Place of acquisition
 CA-BSI 471 113 (103–123) 106 463 105 (95–115) 98
 HCA-BSI 316 76 (68–84) 72 471 106 (97–116) 96
 HA-BSI 134 32 (27–38) 30 140 32 (27–37) 29
Infection focus
 Urinary tract 316 76 (68–84) 70 436 98 (89–108) 90
 Lungs 169 40 (35–47) 38 162 37 (31–43) 34
 Biliary tract 106 25 (21–31) 23 114 26 (21–31) 23
 Gastrointestinal tract 47 11 (8–15) 11 54 12 (9–16) 12
 Skin or soft tissue 81 19 (15–24) 18 62 14 (11–18) 13
 Other 108 25 (21–31) 24 139 31 (26–37) 30
 Unknown 94 22 (18–28) 21 107 24 (20–29) 22
Microbe group
 Gram-negative BSI 499 119 (109–130) 111 634 143 (132–155) 131
 Gram-positive BSI 386 92 (83–102) 87 391 88 (80–97) 81
 Polymicrobial or fungal BSI 36 9 (6–12) 8 49 11 (8–15) 10
Microbes (the four most common)c
Escherichia coli 303 73 (65–81) 68 383 86 (78–96) 79
Streptococcus pneumoniae 127 30 (25–36) 29 99 22 (18–27) 21
Staphylococcus aureus 100 24 (19–29 22 118 27 (22–32) 25
Klebsiella spp. 47 11(8–15) 10 88 20 (16–24) 18
  1. aBSI episodes per 100,000 person-years (417,682 person-years in 2002–2007; 442,948 person-years in 2008–2013)
  2. bage and sex standardized to the population of Norway 2010
  3. cless common BSI microbes are listed in Additional file 1: Table S5