Equis ISSN 2398-2977

Pharynx: nasopharyngeal swab

Synonym(s): Nasopharyngeal swab

Contributor(s): Christopher Brown, N Chanter, Karen Dunn, Jonathan Newton, Vetstream Ltd, James Wood - Director

Introduction

  • Clinically healthy horses can carryStreptococcus equiin the guttural pouch or nasopharynx.
  • Asymptomatic carriage of the bacteria is considered important in the persistance of infection within herds and to the introduction of infection to naive groups of horses and subsequent outbreaks of strangles   Strangles (Streptococcus equi infection)  .
  • It is recommended that all infected and new horses be quarantined and swabbed at weekly intervals.
  • Horses should not released to the herd until 3 consecutive negative results are obtained.
Print off the Owner factsheet on Samples - how they help your vet to give to your clients.

Uses

  • Identification of carriers ofS. equivar equi.
  • Monitoring response to treatment and isolation of infected horses.

Advantages

  • Simple technique.
  • Done in standing animal.
  • Repeated sampling (3 times) increases sensitivity to 85%.

Disadvantages

  • Negative results are not significant (single samples have only 45% sensitivity).
  • False negative results are common.

Requirements

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Preparation

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Procedure

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Aftercare

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Outcomes

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Rendle D (2012) Making the most of samples from the equine respiratory tract - a clinician's perspective on clinical pathology. UK Vet 17 (4), 4-9 VetMedResource.
  • Newton J R et al (1997) Naturally occurring persistent and asymptomatic infection of the guttural pouches of horses with Streptococcus equi. Vet Rec 140 (4), 84-90 PubMed.


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