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Antibiotics are not always the cure
When patients with infection symptoms go to see their doctor, they often expect a prescription for antibiotics. Many infections, however, are of viral origin. In viral illnesses antibiotics are not only ineffective but also contribute to the development of antibiotic resistance, which is an increasing and serious public health problem.
An easy-to-use diagnostic test that assists you to differentiate between bacterial and viral infections and provides an analytically accurate and immediate result during the patient�s visit can effectively guide you on appropriate antibiotic use.


Diagnostic dilemma
Primary health care professionals are often confronted with the question whether a patient�s symptoms are related to a bacterial infection or a viral infection, and whether the patient really needs antibiotics or not.

The dilemma of distinguishing between bacterial and viral infections together with the lack of diagnostic tools, patient pressure and time constraints,1-5 may lead to an unnecessary antibiotic prescription. About 80-90% of antibiotics are prescribed in primary care, and up to 80% of these are used to treat acute respiratory
tract infections.6-9 It is estimated that 50% of all antibiotic prescriptions in primary care are unnecessary.6-9

Although most acute respiratory tract infections are caused by viruses and although antibiotics offer at best a modest benefit, 10 they are frequently used to treat these conditions.11 Inappropriate and excessive use of antibiotics is acknowledged as a main cause of antibiotic resistance.4,12,13

The lack of diagnostic tools makes it difficult for the prescriber to have the right arguments to convince the patient and himself that antibiotics are not needed in the individual case1


Antibiotic resistance and primary care

Antibiotic resistance is one of the most serious public health problems12,14,15 and increasing at an alarming rate in primary care settings, too, making daily treatment decisions more challenging.16


Facts about antibiotic resistance

  • many previously effective antibiotics are now ineffective14,16,17
  • new bacterial strains have emerged that are resistant to several antibiotics at the same time16,17
  • excessive use of broad-spectrum antibiotics is also driving up resistance problems6,18,19
  • antibiotic resistance is causing a heavy cost on the society.21

The use of antibiotics in primary care varies considerably between countries, which is unlikely to be caused by differences in frequency of bacterial infections.20 A correlation between a high use of antibiotics and higher rate of antibiotic resistance has been observed.13,15 Nations worldwide have developed strategies to fight antibiotic resistance and to keep those antibiotics working which are still effective.12,14,21 Containment of inappropriate and excessive antibiotic use
may contribute to slowing down or even reversing the development of antibiotic resistance.22,23

The WHO claims that inadequate access to appropriate nearpatient
diagnostic tools can also be a driving factor for prescribing antibiotics when not clearly indicated.12 A diagnostic tool providing an objective and immediate test
result that confirms or rules out viral infection could have an important role in reducing inappropriate use of antibiotics.


Overuse of antibiotics is jeopardizing the usefulness of essential drugs. Decreasing inappropriate antibiotic use is the best way to control resistance14


C-reactive protein
Measurement of C-reactive protein (CRP) is helpful in the clinical management of a patient with symptoms of an infection.





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Specific features of CRP
  • normally present in very low concentrations in the blood of healthy people; 99% have levels of <10 mg/l24
  • uncomplicated viral infections mostly induce (with some exceptions) a very modest elevation or none at all24
  • in bacterial infections, concentrations increase markedly24
  • elevated concentrations can be detected within 6-12 h after onset of an inflammatory stimulus, reaching maximum within 24-48 h25,26
  • rise in concentrations corresponds to severity of infection24
  • concentrations fall rapidly when the patient responds to antibiotic treatment24
  • normalisation of the concentration may indicate that the duration of treatment has been sufficient and the treatment can be discontinued.24,27,28

CRP and infection

When evaluated in the light of the patient’s clinical condition, measurement of CRP can assist in differentiating between bacterial infections and viral infections and in rationalising antibiotic therapy. Measurement of CRP has long been used as a routine diagnostic test in laboratories. However, obtaining the CRP result from an external laboratory takes too long for adequate support of the diagnostic decision in a primary care setting where the health care professional requires the test result immediately during the patient visit.

  • CRP can be used as a predictor for bacterial infection due to the inflammation that occurs when there is bacterial infection present
  • Uncomplicated viral infections mostly induce a very modest elevation or none at all
  • In bacterial infections, concentrations increase markedly
  • Concentrations fall rapidly when the patient responds to antibiotic treatment
  • Normalization of the concentration may indicate that the duration of treatment has been sufficient and the treatment can be discontinued

 

Serial CRP

  • In the ICU, CRP is useful in determining the efficacy of antibiotic therapy
  • By checking CRP regularily it may be possible to see whether or not the current antibiotic therapy effective

Antibiotic resistance and primary care
Antibiotic resistance is one of the most serious public health problems12,14,15 and increasing at an alarming rate in primary care settings, too, making daily treatment decisions more challenging.16

Facts about antibiotic resistance

  • many previously effective antibiotics are now ineffective14,16,17
  • new bacterial strains have emerged that are resistant to several antibiotics at the same time16,17
  • excessive use of broad-spectrum antibiotics is also driving up resistance problems6,18,19
  • antibiotic resistance is causing a heavy cost on the society.21

The use of antibiotics in primary care varies considerably between countries, which is unlikely to be caused by differences in frequency of bacterial infections.20 A correlation between a high use of antibiotics and higher rate of antibiotic resistance has been observed.13,15 Nations worldwide have developed strategies to fight antibiotic resistance and to keep those antibiotics working which are still effective.12,14,21 Containment of inappropriate and excessive antibiotic use may contribute to slowing down or even reversing the development of antibiotic resistance.22,23

The WHO claims that inadequate access to appropriate nearpatient diagnostic tools can also be a driving factor for prescribing antibiotics when not clearly indicated.12 A diagnostic tool providing an objective and immediate test result that confirms or rules out viral infection could have an important role in reducing inappropriate use of antibiotics.

Overuse of antibiotics is jeopardizing the usefulness of essential drugs. Decreasing inappropriate antibiotic use is the best way to control resistance14

C-reactive protein
Measurement of C-reactive protein (CRP) is helpful in the clinical management of a patient with symptoms of an infection.

CRP and Inflammatory Disorders

  • CRP is a useful inflammatory marker used to monitor the disease progress or response  to treatment in patients with chronic inflammatory disorders such as rheumatoid arthritis or Chrons Disease
  • When the disease is active it becomes elevated and when disease is in remission it returns to normal

QuikRead CRP shows good concordance with standard laboratory methods and may lead to a more rational approach to patients with respiratory infections29 The QuikRead CRP offers an excellent cost effective tool to augment clinical judgement whilst facilitating optimal time management in the ICU or private practise



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References


  1. Nordberg P et al. Consumers and Providers – could they make better use of antibiotics? The Global Threat of Antibiotic Resistance: Exploring Roads towards Concerted Action. A multidisciplinary meeting at the Dag Hammarskjöld Foundation, Uppsala, Sweden, 5-7 May 2004. Background material. Available at .

  2. Pichichero ME. Understanding Antibiotic Overuse for Respiratory Tract infections in Children. Pediatrics 1999; 104: 1384-1388.

  3. Pétursson P. Why Non-Pharmacological Prescribing of Antibiotics? – A Phenomenological Investigation into the Rationale behind it from the GP’s perspective. Master of Public Health Essay (Nordic School of Public Health). MPH 2005: 6.

  4. Avorn MD, Solomon DG. Cultural and Economic Factors That (Mis)Shape Antibiotic Use: The Nonpharmacologic Basis of Therapeutics. Ann Intern Med 2000;133:128-135.

  5. Arnold SR & Strauss SE, Interventions to improve antibiotic prescribing practices
    in ambulatory care. The Cochrane Database of Systematic Reviews 2005, Issue 4. Art No.: CD003539.pub2.

  6. Wise R et al. Antimicrobial resistance is a major threat to public health. BMJ 1998;317:609-10.

  7. Mölstad S. Reduction in antibiotic prescribing for respiratory tract infections is needed! Scand J Prim Health Care 2003;21:196-8.

  8. Huovinen P, Cars O. Control of antimicrobial resistance: time for action. The essentials of control are already well known. BMJ 1998; 317: 613-4.

  9. Kuyvenhoven MM et al. Outpatient antibiotic prescriptions from 1992 to 2001in The Netherlands. JAC 2003;52:675-678.

  10. Arroll B, Kenealy T. Antibiotics for the common cold and acute purulent rhinitis. The Cochrane Database of Systematic Reviews 2005, Issue 3. Art. No.: CD000247.pub2.

  11. Watson Rl et al. Antimicrobial Use for Pediatric Upper Respiratory Infections: Reported Practice, Actual Practice, and Parent Beliefs. Pediatrics 1999; 104: 1251-7.

  12. World Health Organization. WHO Global Strategy for Containment of Antimicrobial Resistance. Available at . Accessed on 19 April 2006.

  13. Bonzwaer SLAM et al. A European Study on the Relationship between
    Antimicrobial Use and Antimicrobial Resistance. Emerg Inf Dis 2002; 8(3): 278-282.

  14. Centers for Disease Control and Prevention (CDC). CDC antimicrobial resistance campaigns: Campaign for Appropriate Antibiotic Use in the Community. Available at. Accessed on 19 April 2006.

  15. Goossens H et al. Outpatient antibiotic use in Europe and association with resistance: a cross-national database study. Lancet 2005; 365: 579- 87.

  16. Hooton TM, Levy SB. Antimicrobial Resistance: A Plan of Action for Community Practice. Am Fam Physician 2001; 63(6): 1087-1096.

  17. European Commission. Antibiotic resistance. A growing threat. Prudent use of antibiotics is vital. Available at . Accessed on 19 April 2006.

  18. Steinman MA et al. Predictors of Broad-Spectrum Antibiotic Prescribing for Acute Respiratory Tract Infections in Adult Primary Care. JAMA 2003; 289: 719-725.

  19. Hyde TB et al. Macrolide Resistance Among Invasive Streptococcus pneumoniae
    Isolates. JAMA 2001; 286: 1857-1862.

  20. Cars O, et al Variation in antibiotic use in the European Union. The Lancet 2001; 375: 1851-1853.

  21. The Council of European Union. Council Recommendation of 15 November 2001 on the prudent use of antimicrobial agents in human medicine. (2202/77/EC). Official Journal of the European Communities. Available at . Accessed on 19 April 2006.

  22. Seppälä H et al. The effect of the consumption of macrolide antibiotics on erythromycin resistance in group A streptococci in Finland. N Engl J Med 1997; 337: 441-6.

  23. Stephenson J. Icelandic researchers are showing the way to bring down rates of antibiotic-resistant bacteria. JAMA 1996; 275: 175.

  24. Pepys MB. The acute phase response and C-reactive protein. In: Warrell DA, Coz TM, Firth JD, Benz EJ, eds. Oxford Textbook of Medicine, 4th ed. Oxford University Press, 2003. Vol 2, p. 150-156.

  25. Bjerrum L. C-reactive protein measurement in general practice may lead to lower antibiotic prescribing for sinusitis. Br J Gen Pract 2004; 54: 659-662.

  26. Pepys MB. C-reactive protein fifty years on. Lancet 1981; 1: 653-657.

  27. Philip AGS, Mills PC. Use of C-reactive Protein in Minimizing Antibiotic Exposure: Experience With Infants Initially Admitted to a Well- Baby Nursery. Pediarics 2000; 106.

  28. Ehl S et al. C-reactive Protein Is a Useful Marker for Guiding Duration of Antibiotic Therapy in Suspected Neonatal Bacterial Infection. Pediarics 1997; 99: 216-221.

  29. Esposito S et al. Evaluation of a rapid beside test for the quantitative determination of C-reactive protein. Clin Chem Lab Med 2005; 43(4): 438-440.

  30. Seamark DA et al. Field-testing and validation in a primary care setting
    of a point-of-care test for C-reactive protein. Ann Clin Biochem 2003; 40: 178-80.

  31. Paloheimo L et al. A Fast B-CRP Assay for Near-Patient Testing (NPT) or Point-of-Care Testing (POCT). Poster presented at Laboratory Medicine 2000/XXVII Nordic Congress of Clinical Chemistry, Bergen, Norway 4-8 June 2000.




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