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MRSP: prevalence in practice
  1. Narayan Chandra Paul, DVM, MS, PhD
  1. College of Veterinary Medicine, Washington State University, Pullman 99164, WA, USA
  1. e-mail: ncp{at}

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Staphylococcus pseudintermedius, described as a new species in 2005 (Devriese and others 2005), is part of the normal microflora of skin and mucosae of dogs. It is commonly associated with various cutaneous, ear and wound infections such as pyoderma and otitis externa in dogs and cats.

S pseudintermedius belongs to the Staphylococcus intermedius group (SIG) of bacteria, along with Staphylococcus intermedius and Staphylococcus delphini. Because species in the SIG group share common phenotypic characteristics, sometimes it is difficult to differentiate between them based on phenotypic tests alone. However, SIG isolates from dogs can be considered to be S pseudintermedius because of their host specificity.

S pseudintermedius is very common in dogs, with an estimated 46 to 92 per cent of dogs carrying it (Bannoehr and Guardabassi 2012). It mainly colonises the skin, hair follicles and mucosal sites of healthy dogs; however, the mouth and perineum are the most common site of S pseudintermedius carriage (Paul and others 2012).

The rapid emergence of meticillin-resistant S pseudintermedius (MRSP) in small animals in the past decase has drawn attention to veterinary practice. …

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