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Table 1 Age-specific average annual frequency and notification rates of IDs in Norway in 2007 to 2011

From: What are the most important infectious diseases among those ≥65 years: a comprehensive analysis on notifiable diseases, Norway, 1993–2011

Notifiable infectious disease* Average annual frequency Average annual notification rate (range)/100,000 inhabitants NRR 7(range)
  Total ≥65 years Total <5 years 5-19 years 20-64 years ≥65 years 65+/20-64
Overall 15870 1792 332 (307–362) 330 (285–407) 330 (276–399) 351 (312–411) 253 (236–280) 0.7 (0.6-0.9)
   Invasive bacterial diseases (IBD)         
Pneumococcal IBD 818 411 17.1 (14.9-20.4) 13.0 (9.1-19.7) 2.3 (1.2-3.1) 12.1 (10.1-14.9) 58.1 (51.6-66.4) 4.8 (4.4-5.1)
Group B Streptococcal IBD 178 78 3.7 (3.4 -3.9) 14.1 (12.3-15.9) 0.2 (0.0-0.4) 2.0 (1.8-2.2) 11.0 (9.8-12.5) 5.6 (4.5-7.6)
Group A Streptococcal IBD 163 68 3.4 (2.8-3.6) 2.6 (1.0) 0.7 (0.4-0.9) 2.8 (2.1-3.2) 9.5 (8.8-10.7) 3.4 (2.7-4.5)
Haemophilus influenzae IBD 81 40 1.7 (1.5-1.8) 2.2 (1.4-3.4) 0.4 (0.2-0.5) 1.1 (0.8-1.4) 5.7 (4.4-7.0) 5.6 (3.5-8.9)
Meningococcal IBD 37 5.8 0.8 (0.6-0.9) 3.2 (2.3-4.1) 1.3 (0.9-2.0) 0.3 (0.3-0.4) 0.8 (0.3-1.1) 2.4 (1.0-3.6)
   Food- and waterborne diseases 1         
Campylobacteriosis 2839 217 59.2 (55.0-60.9) 62.4 (47.7-77.7) 36.2 (31.1-41.6) 73.4 (70.5-75.6) 30.5 (25.1-38.3) 0.4 (0.4-0.5)
Salmonellosis 1485 125 31.0 (26.0-40.8) 48.2 (36.9-56.9) 22.4 (18.1-30.0) 35.3 (28.0-47.5) 17.6 (12.3-21.8) 0.5 (0.4-0.7)
Listeriosis 31 20 0.7 (0.4-1.0) 0.3 (0.0-0.7) 0.0 (0.0-0.0) 0.4 (0.1-0.7) 2.8 (2.3-4.2) 15.6 (3.8-37.5)
Enteropathogenic E. coli-enteritis 2 272 9.2 5.6 (2.3-9.3) 61.1 (15.2-115.9) 2.2 (0.8-3.2) 2.0 (1.8-2.2) 1.3 (0.4-2.2) 0.6 (0.2-1.0)
Giardiasis 192 9.0 4.0 (3.6-5.0) 7.9 (4.8-10.1) 3.4 (2.8-3.7) 4.5 (3.9-5.8) 1.3 (0.8-1.9) 0.3 (0.2-0.3)
Shigellosis 144 6.4 3.0 (2.7-3.3) 3.7 (1.9-5.5) 1.8 (1.4-2.4) 3.8 (3.3-4.7) 0.90 (0.3-1.4) 0.2 (0.1-0.4)
Paratyphoid fever 16 1.0 0.3 (0.2-0.4) 0.3 (0.0-0.7) 0.3 (0.0-0.9) 0.4 (0.2-0.5) 0.1 (0.0-0.4) 0.4 (0.0-1.1)
Yersiniosis 59 2.8 1.2 (1.1-1.5) 3.4 (2.2-4.4) 1.0 (0.7-1.3) 1.3 (1.0-1.7) 0.4 (0.0-0.7) 0.3 (0. 0–0.6)
Typhoid fever 17 0.2 0.4 (0.2-0.6) 0.6 (0.3-1.7) 0.5 (0.4-0.5) 0.4 (0.2-0.7) 0.0 (0.0-0.1) 0.0 (0.0-0.2)
   Vaccine preventable diseases         
Pertussis 4328 383 90.4 (66.3-115.5) 56.3 (42.8-63.8) 211.5 (162.0-277.6) 63.4 (44.0-82.1) 54.2 (34.8-70.4) 0.9 (0.7-1.0)
Mumps 3 16 1.4 0.3 (0.2-0.5) 0.1 (0.0-0.6) 0.3 (0.1-1.0) 0.4 (0.3-0.5) 0.2 (0.1-0.3) 0.6 (0.3-1.0)
Tetanus 1.0 1.0 0.0 (0.0-0.0) 0.0 (0.0-0.0) 0.0 (0.0-0.0) 0.0 (0.0-0.0) 0.1 (0.0-0.3) ∞ (∞)
   Antibiotic-resistant bacteria         
MRSA infection 3, 4 420 92 8.7 (7.3-11.4) 11.0 (8.8-13.3) 6.5 (5.1-9.4) 8.2 (6.6-11.4) 13 (11.4-16.1) 1.6 (1.2-2.1)
MRSA carriage 3, 4 384 82 8.0 (5.6-9.9) 16.3 (8.6-21.4) 4.6 (1.5-6.6) 7.3 (4.9-9.2) 12.2 (10.6-14.8) 1.7 (1.2-2.7)
Vancomycin-resistant enterococci 3 51 33 1.0 (0.1-4.3) 0.1 (0.1-0.3) 0.1 (0.0-0.4) 0.6 (0.1-2.3) 4.5 (0.6-19.4) 6.5 (4.0-8.6)
Penicillin-resistant pneumococci 3 11 1.4 0.2 (0.0-0.5) 1.1 (0.0-3.5) 0.1 (0.0-0.2) 0.2 (0.0-0.4) 0.2 (0.1-0.3) 1.7 (0.4-4.0)
   Zoonosis/vector-borne diseases         
Lyme borreliosis 3 297 57 6.2 (5.1-7.3) 5.6 (4.6-6.2) 8.9 (6.3-10.9) 4.9 (3.6-6.4) 8.1 (6.3-9.8) 1.7 (1.5-1.9)
Tularaemia 66 10 1.4 (0.3-3.6) 0.7 (0.0-2.3) 1.0 (0.2-2.8) 1.5 (0.3-3.9) 1.4 (0.1-3.8) 0.8 (0.4-1.0)
HFRS 5/Nephropathia epidemica 40 4.6 0.8 (0.4-1.6) 0.1 (0.0-0.3) 0.3 (0.1-0.6) 1.2 (0.6-2.3) 0.7 (0.3-1.2) 0.7 (0.2-1.0)
Malaria 32 1.0 0.7 (0.6-0.8) 0.2 (0.0-0.3) 0.2 (0.1-0.3) 1.0 (0.9-1.2) 0.1 (0.0-0.4) 0.1 (0.0-0.4)
   Blood-borne/STI         
Hepatitis C 3, 6 2270 36 47.2 (33.7-70.5) 2.3 (1.0-4.8) 5.1 (4.0-7.0) 76.1 (53.6-114.1) 5.0 (4.6-5.8) 0.1 (0.1-0.1)
Hepatitis B (chronic carriage) 693 13 14.4 (14.3-17.4) 0.7 (0.0-1.4) 8.5 (6.4-11.0) 20.9 (15.7-24.9) 1.8 (1.0-2.3) 0.1 (0.1-0.1)
Gonorrhoea 266 4.2 5.5 (4.6-6.3) 0.1 (0.0-0.3) 1.4 (0.9-1.6) 8.7 (7.4-9.8) 0.6 (0.1-1.2) 0.1 (0.0-0.1)
Hepatitis A 36 3.0 0.7 (0.4-1.0) 1.1 (0.7-2.3) 0.9 (0.6-1.4) 0.7 (0.3-1.1) 0.4 (0.1-1.0) 0.6 (0.4-1.4)
HIV infection 256 2.6 5.3 (4.9-5.9) 0.9 (0.0-2.1) 0.6 (0.4-0.9) 8.6 (8.0-9.5) 0.4 (0.3-0.6) 0.0 (0.0-0.1)
AIDS 33 2.2 0.7 (0.4-0.9) 0.0 (0.0-0.0) 0.0 (0.0-0.2) 1.0 (0.6-1.4) 0.3 (0.0-1.0) 0.3 (0.0-1.0)
Hepatitis B (acute infection) 71 1.4 1.5 (0.6-2.6) 0.1 (0.0-0.3) 0.6 (0.1-1.3) 2.2 (0.9-3.8) 0.2 (0.0-0.4) 0.1 (0.0-0.2)
Syphilis 88 0.8 1.8 (1.2-2.6) 0.0 (0.0-0.0) 0.1 (0.0-0.6) 3.0 (1.9-4.4) 0.1 (0.0-0.3) 0.0 (0.0-0.1)
   Other diseases         
Tuberculosis 336 38 7.0 (6.5-7.5) 1.5 (0.7-2.1) 4.4 (3.5-4.6) 8.8 (7.7-9.7) 5.3 (4.5-6.9) 0.6 (0.5-0.9)
Encephalitis 179 17 3.7 (2.8-6.4) 8.8 (5.5-17.2) 2.4 (1.4-4.9) 3.9 (2.9-6.5) 2.4 (1.9-3.2) 0.6 (0.5-0.8)
Legionellosis 40 15 0.8 (0.7-1.0) 0.0 (0.0-0.0) 0.0 (0.0-0.0) 0.9 (0.7-1.1) 2.1 (1.5-3.0) 2.3 (1.8-3.2)
Creutzfeldt Jacob 3 9.6 7.2 0.2 (0.1-0.3) 0.0 (0.0-0.0) 0.0 (0.0-0.0) 0.1 (0.0-0.1) 1.0 (0.3-1.4) 12.3 (2.0-∞)
  1. IDs = infectious diseases.
  2. *Note that data for botulism, cholera, rubella and brucellosis are not presented, as no such cases aged ≥65 years occurred between 2007 and 2011 (notification rate = 0/100,000).
  3. 1: Note that food- and waterborne infections can have been transmitted in other modes than through food and water, such as via infected individuals and animals.
  4. 2: Enteropathogenic E.(Escherichia) coli-enteritis includes Haemolytic Uremic Syndrome.
  5. 3: For the following diseases, notification became mandatory or the last change in notification guidelines was implemented after 1993: Mumps, MRSA infections, Lyme borreliosis (1995); Creutzfeldt Jacob (1997); MRSA carriage, vancomycin-resistant enterococci, penicillin-resistant pneumococci (2005); hepatitis C (2008).
  6. 4: MRSA = Methicillin-resistant Staphylococcus aureus.
  7. 5: HFRS = Haemorrhagic fever with renal syndrome.
  8. 6: Because hepatitis C became notifiable only since 2008, these results only include data of 2008–2011.
  9. 7: The notification rate ratio (NRR) was calculated by dividing the average notification rate in 2007–2011 among the population ≥65 years by the average notification rate among those aged 20–64 years. A NRR above 1 reflects a higher notification rate in the population ≥65 years compared to those aged 20–64 years, while a NRR below 1 reflects a lower NRR in the population ≥65 years.