Vala Fridriksdottir

Publications (3)10.31 Total impact

• Source

  Available from: PubMed Central

  Article: Broiler chickens as source of human fluoroquinolone-resistant Escherichia coli, Iceland.

  Thorunn R Thorsteinsdottir, Gunnsteinn Haraldsson, Vala Fridriksdottir, Karl G Kristinsson, Eggert Gunnarsson
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  ABSTRACT: To investigate feed as a source for fluoroquinolone-resistant Escherichia coli in broiler chickens, we compared antimicrobial drug-resistant E. coli from broiler feed and broilers with ciprofloxacin-resistant human clinical isolates by using pulsed-field gel electrophoresis. Feed was implicated as a source for ciprofloxacin-resistant broiler-derived E. coli and broilers as a source for ciprofloxacin-resistant human-derived E. coli.
  Emerging Infectious Diseases 01/2010; 16(1):133-5. · 6.79 Impact Factor
• Article: Antimicrobial resistance of Campylobacter spp. isolated from broiler flocks in Iceland 2001-2005.

  Thorunn R Thorsteinsdottir, Karl G Kristinsson, Vala Fridriksdottir, Eggert Gunnarsson
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  ABSTRACT: Minimum inhibitory concentrations of six antimicrobial agents were determined for one Campylobacter sp. isolate from each of the 362 Campylobacter-positive commercial chicken flocks in Iceland in the years 2001-2005. Of all isolates tested, 6.9% were resistant, although none were multiresistant. Resistance to ampicillin was most commonly observed (3.6%) followed by resistance to enrofloxacin (3%), nalidixic acid (1.9%), and oxytetracyclin (0.3%), with cross-resistance between enrofloxacin and nalidixic acid. All isolates were susceptible to erythromycin and gentamicin. Resistance rates among Campylobacter coli isolates (7/13 or 53.8%) were much higher than among Campylobacter jejuni isolates (18/349 or 5.2%), and resistance patterns differed. Resistant strains were compared using pulsed field gel electrophoresis. Macrorestriction with SmaI and KpnI restriction enzymes yielded 13 different pulsotypes, none of which indicated a predominant genotype. Specific pulsotypes with uniform resistance patterns arising on geographically separated farms indicate clonal dissemination. Although resistance levels were low and similar to that seen in the other Nordic countries, further research on this matter is needed as there is no antimicrobial selective pressure in chicken farming in Iceland.
  Microbial Drug Resistance 04/2008; 14(1):49-53. · 2.15 Impact Factor
• Article: Paratuberculosis in Iceland--ongoing research.

  Vala Fridriksdottir, Eggert Gunnarsson, Sigurdur Sigurdarson, Kristin Bjorg Gudmundsdottir
  Acta veterinaria Scandinavica 02/2003; 44(3-4):273. · 1.37 Impact Factor