Molecular investigation of the viral kinetics of equine herpesvirus-1 in blood and nasal secretions of horses after corticosteroid-induced recrudescence of latent infection

Nicola Pusterla, S. B. Hussey, S. Mapes, Christine K Johnson, J. R. Collier, J. Hill, D. P. Lunn, William D Wilson

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13 Citations (Scopus)

Abstract

Background: Recrudescence of latent equine herpesvirus 1 (EHV-1) with subsequent viral shedding via nasal secretions is a potential source of infection for susceptible horses and has been implicated in outbreaks occurring in closed populations. Objectives: To describe the viral kinetics of reactivated EHV-1 in blood and nasal secretions from latently infected horses after administration of corticosteroids, and to study the infectious nature of reactivated EHV-1 to sentinel horses. Animals: Eight healthy horses. Methods: Four horses infected 4 months previously with EHV-1 received dexamethasone on 5 consecutive days. Four seronegative horses served as sentinels and had direct contact with the latently infected horses. All horses were monitored daily for development of clinical signs. Whole blood and nasal secretions were collected daily for molecular detection and cell culture of EHV-1. Serum was collected weekly for the detection of antibodies against EHV-1. Results: All horses in the latently infected group showed transient molecular detection of EHV-1 in blood and nasal secretions, but only 1 horse developed fever. Three latently infected horses developed an increase in antibody concentrations against EHV-l. Viral cultures remained negative for all latently infected horses after corticosteroid administration. None of the sentinel horses developed clinical signs, viremia, viral shedding, or seroconversion. Conclusions and Clinical Importance: EHV-1 was successfully reactivated after corticosteroid administration in latently in fected horses. However, transmission of reactivated virus to sentinel horses was unsuccessful. Failure to effectively transmit EHV-1 to susceptible horses may have resulted from the low level and short period of viral shedding in latently infected horses.

Original languageEnglish (US)
Pages (from-to)1153-1157
Number of pages5
JournalJournal of Veterinary Internal Medicine
Volume24
Issue number5
DOIs
StatePublished - Sep 2010

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Equid Herpesvirus 1
Equid herpesvirus 1
adrenal cortex hormones
Nose
Horses
Adrenal Cortex Hormones
secretion
horses
kinetics
Recurrence
blood
Infection
infection
Virus Shedding
viral shedding

Keywords

  • EHV-1
  • Reactivation
  • Transmission

ASJC Scopus subject areas

  • veterinary(all)

Cite this

@article{dd8f94b41bad466aac9536e1b9bac118,
title = "Molecular investigation of the viral kinetics of equine herpesvirus-1 in blood and nasal secretions of horses after corticosteroid-induced recrudescence of latent infection",
abstract = "Background: Recrudescence of latent equine herpesvirus 1 (EHV-1) with subsequent viral shedding via nasal secretions is a potential source of infection for susceptible horses and has been implicated in outbreaks occurring in closed populations. Objectives: To describe the viral kinetics of reactivated EHV-1 in blood and nasal secretions from latently infected horses after administration of corticosteroids, and to study the infectious nature of reactivated EHV-1 to sentinel horses. Animals: Eight healthy horses. Methods: Four horses infected 4 months previously with EHV-1 received dexamethasone on 5 consecutive days. Four seronegative horses served as sentinels and had direct contact with the latently infected horses. All horses were monitored daily for development of clinical signs. Whole blood and nasal secretions were collected daily for molecular detection and cell culture of EHV-1. Serum was collected weekly for the detection of antibodies against EHV-1. Results: All horses in the latently infected group showed transient molecular detection of EHV-1 in blood and nasal secretions, but only 1 horse developed fever. Three latently infected horses developed an increase in antibody concentrations against EHV-l. Viral cultures remained negative for all latently infected horses after corticosteroid administration. None of the sentinel horses developed clinical signs, viremia, viral shedding, or seroconversion. Conclusions and Clinical Importance: EHV-1 was successfully reactivated after corticosteroid administration in latently in fected horses. However, transmission of reactivated virus to sentinel horses was unsuccessful. Failure to effectively transmit EHV-1 to susceptible horses may have resulted from the low level and short period of viral shedding in latently infected horses.",
keywords = "EHV-1, Reactivation, Transmission",
author = "Nicola Pusterla and Hussey, {S. B.} and S. Mapes and Johnson, {Christine K} and Collier, {J. R.} and J. Hill and Lunn, {D. P.} and Wilson, {William D}",
year = "2010",
month = "9",
doi = "10.1111/j.1939-1676.2010.0554.x",
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TY - JOUR

T1 - Molecular investigation of the viral kinetics of equine herpesvirus-1 in blood and nasal secretions of horses after corticosteroid-induced recrudescence of latent infection

AU - Pusterla, Nicola

AU - Hussey, S. B.

AU - Mapes, S.

AU - Johnson, Christine K

AU - Collier, J. R.

AU - Hill, J.

AU - Lunn, D. P.

AU - Wilson, William D

PY - 2010/9

Y1 - 2010/9

N2 - Background: Recrudescence of latent equine herpesvirus 1 (EHV-1) with subsequent viral shedding via nasal secretions is a potential source of infection for susceptible horses and has been implicated in outbreaks occurring in closed populations. Objectives: To describe the viral kinetics of reactivated EHV-1 in blood and nasal secretions from latently infected horses after administration of corticosteroids, and to study the infectious nature of reactivated EHV-1 to sentinel horses. Animals: Eight healthy horses. Methods: Four horses infected 4 months previously with EHV-1 received dexamethasone on 5 consecutive days. Four seronegative horses served as sentinels and had direct contact with the latently infected horses. All horses were monitored daily for development of clinical signs. Whole blood and nasal secretions were collected daily for molecular detection and cell culture of EHV-1. Serum was collected weekly for the detection of antibodies against EHV-1. Results: All horses in the latently infected group showed transient molecular detection of EHV-1 in blood and nasal secretions, but only 1 horse developed fever. Three latently infected horses developed an increase in antibody concentrations against EHV-l. Viral cultures remained negative for all latently infected horses after corticosteroid administration. None of the sentinel horses developed clinical signs, viremia, viral shedding, or seroconversion. Conclusions and Clinical Importance: EHV-1 was successfully reactivated after corticosteroid administration in latently in fected horses. However, transmission of reactivated virus to sentinel horses was unsuccessful. Failure to effectively transmit EHV-1 to susceptible horses may have resulted from the low level and short period of viral shedding in latently infected horses.

AB - Background: Recrudescence of latent equine herpesvirus 1 (EHV-1) with subsequent viral shedding via nasal secretions is a potential source of infection for susceptible horses and has been implicated in outbreaks occurring in closed populations. Objectives: To describe the viral kinetics of reactivated EHV-1 in blood and nasal secretions from latently infected horses after administration of corticosteroids, and to study the infectious nature of reactivated EHV-1 to sentinel horses. Animals: Eight healthy horses. Methods: Four horses infected 4 months previously with EHV-1 received dexamethasone on 5 consecutive days. Four seronegative horses served as sentinels and had direct contact with the latently infected horses. All horses were monitored daily for development of clinical signs. Whole blood and nasal secretions were collected daily for molecular detection and cell culture of EHV-1. Serum was collected weekly for the detection of antibodies against EHV-1. Results: All horses in the latently infected group showed transient molecular detection of EHV-1 in blood and nasal secretions, but only 1 horse developed fever. Three latently infected horses developed an increase in antibody concentrations against EHV-l. Viral cultures remained negative for all latently infected horses after corticosteroid administration. None of the sentinel horses developed clinical signs, viremia, viral shedding, or seroconversion. Conclusions and Clinical Importance: EHV-1 was successfully reactivated after corticosteroid administration in latently in fected horses. However, transmission of reactivated virus to sentinel horses was unsuccessful. Failure to effectively transmit EHV-1 to susceptible horses may have resulted from the low level and short period of viral shedding in latently infected horses.

KW - EHV-1

KW - Reactivation

KW - Transmission

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DO - 10.1111/j.1939-1676.2010.0554.x

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EP - 1157

JO - Journal of Veterinary Internal Medicine

JF - Journal of Veterinary Internal Medicine

SN - 0891-6640

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