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Short Communication
In vitro activity of rifaximin against Chlamydia suis
  1. S. Pignanelli, MD1 and
  2. A. Shurdhi, MD2
  1. L. A. C. C. M. S. Maria della Scaletta Hospital-AUSL Imola, 4 via Montericco, 40027 Imola (Bologna), Italy
  2. Department of Pathology and Laboratory Medicine, Section of Microbiology, University Hospital of Parma, 14 Viale Gramsci, 43126 Parma, Italy
  1. E-mail for correspondence dott.pignanelli{at}

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Antimicrobial agents are used in veterinary practices to minimise economic losses of farmers due to infectious diseases. The antibiotics are often selected based on historical efficacy data, cost effectiveness and drug withdrawal time. The increase of bacterial resistances to antimicrobial agents reduces their effectiveness in the treatment of infectious diseases. Many strains of Chlamydia suis, a pathogen of pigs, express a stable tetracycline resistance phenotype (Dugan and others 2004, 2007, Di Francesco and others 2008). This bacterium causes common intestinal infections in swine. Prevalence of these infections increases after three to four weeks of age (Nietfeld and others 1997). Although C suis has been detected in cases of diarrhoea, some studies suggest that most intestinal infections are asymptomatic (Schautteet and Vanrompay 2011). Therefore, intestinal localisation can also facilitate the diffusion of C suis in the farm pigs and in other anatomic sites (eg, genital tract). From 2004 to 2007, 14 chlamydial isolates were collected from …

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