Effect of valacyclovir on EHV-5 viral kinetics in horses with equine multinodular pulmonary fibrosis

Charlotte A. Easton-Jones, John E Madigan, Samantha Barnum, Lara K. Maxwell, Sandra D. Taylor, Terry Arnesen, Nicola Pusterla

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Background: Equine herpesvirus-5 is commonly isolated from the lungs of horses with EMPF, suggesting an etiological link. Valacyclovir is used empirically to treat EMPF; however, no data is available concerning its impact on EHV-5 viral kinetics. Objectives: To determine the effect of oral administration of valacyclovir on EHV-5 viral load measured by qPCR in blood, nasal secretions (NS) and BALF in horses with EMPF. Animals: Six horses diagnosed with EMPF. Methods: A prospective clinical trial was performed. Horses received 10 days of PO administered valacyclovir (loading dose 30 mg/kg, maintenance dose 20 mg/kg). Blood, NS, and BALF were collected for EHV-5 viral kinetics analyses during treatment. Blood and NS were collected every other day. BALF was collected on day 0 and day 10. Results: There was no statistical difference in median EHV-5 viral load between day 0 and day 10 for all samples tested. In blood median EHV-5 viral load was 7676 (range 575-39 781) on day 0 and 6822 (range 1136-18 635) glycoprotein B (gB) gene copies per million cells on day 10. For NS median EHV-5 viral load was 2.944 × 106 (range 184 691-3.394 × 109) on day 0 and 8.803 × 106 (range 251 186-9.868 × 108) gB gene copies per million cells on day 10. For BALF median EHV-5 viral load was 59,842 (range 61-315 655) on day 0 and 185 083 (range 3562-542 417) gB gene copies per million cells on day 10. Conclusions and Clinical Importance: Valacyclovir might not be an effective short-term antiviral treatment but efficacy in treatment of EMPF is unknown.

Original languageEnglish (US)
Pages (from-to)1763-1767
Number of pages5
JournalJournal of Veterinary Internal Medicine
Volume32
Issue number5
DOIs
StatePublished - Sep 1 2018

Keywords

  • anti-viral drugs
  • herpesvirus
  • interstitial pneumonia
  • qPCR

ASJC Scopus subject areas

  • veterinary(all)

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