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
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 |