Bovine herpes virus type-4 infection among postpartum dairy cows in California: risk factors and phylogenetic analysis

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The aims of this study were to determine the prevalence and associated risk factors of bovine herpes virus type-4 (BoHV-4) infection and describe the genetic characteristics and predominant genotypes of the virus in Yolo and Tulare counties, California. A cross-sectional study involving multi-stage sampling technique was used. One hundred and forty-eight post-partum cows were enrolled from 11 dairy farms. Uterine/vaginal samples were collected and tested for BoHV-4 and other co-infecting viruses using real-time PCR. Data were analysed using multilevel logistic mixed-effect model. Phylogenetic analysis of 10 BoHV-4 isolates was conducted by targeting three open reading frames (ORF3, ORF8 and ORF 22) of the viral genome. The prevalence of BoHV-4 infection was 22.3% (33/148), while post-partum metritis was 33.8% (48/142). Strong association was found between BoHV-4 infection and lactation number, lactation stage and post-partum metritis. The odds of being positive for BoHV-4 infection were 6.47 times (95% CI 1.17–35.92; P < 0.05) and 6.79 times (95% CI 1.19–38.55; P < 0.05) higher for cows in the fourth and fifth lactation, respectively, compared with cows in the first lactation. BoHV-4 was 8.27 times more likely (95% CI 1.43–47.94; P < 0.05) among cows in the early stage of lactation (0–120 days) compared with those in late lactation (>240 days). Cows with post-partum metritis were 4.51 times (95% CI 1.27–16.02; P < 0.05) more likely to test positive for BoHV-4 infection compared with those without post-partum metritis. Phylogenetic analysis of BoHV-4 based on sequencing of glycoprotein and thymidine kinase (TK) genes revealed genetic variability of the virus with glycoprotein B genotype 1 and TK genotype 2 as being dominant genotypes. The reported high genetic variability of BoHV-4 indicates the possibility of co-infection with multiple genotypes.

Original languageEnglish (US)
Pages (from-to)1-9
Number of pages9
JournalEpidemiology and Infection
DOIs
StateAccepted/In press - Apr 10 2018

Fingerprint

Virus Diseases
Postpartum Period
Statistical Factor Analysis
Viruses
Genotype
Lactation
Open Reading Frames
Glycoproteins
Thymidine Kinase
Viral Genome
Coinfection
Real-Time Polymerase Chain Reaction
Cross-Sectional Studies

Keywords

  • Bovine herpes virus type 4
  • California
  • dairy cows
  • phylogenetic analysis
  • prevalence

ASJC Scopus subject areas

  • Epidemiology
  • Infectious Diseases

Cite this

@article{975239a0ba2c4097ac163765cdc7d4f3,
title = "Bovine herpes virus type-4 infection among postpartum dairy cows in California: risk factors and phylogenetic analysis",
abstract = "The aims of this study were to determine the prevalence and associated risk factors of bovine herpes virus type-4 (BoHV-4) infection and describe the genetic characteristics and predominant genotypes of the virus in Yolo and Tulare counties, California. A cross-sectional study involving multi-stage sampling technique was used. One hundred and forty-eight post-partum cows were enrolled from 11 dairy farms. Uterine/vaginal samples were collected and tested for BoHV-4 and other co-infecting viruses using real-time PCR. Data were analysed using multilevel logistic mixed-effect model. Phylogenetic analysis of 10 BoHV-4 isolates was conducted by targeting three open reading frames (ORF3, ORF8 and ORF 22) of the viral genome. The prevalence of BoHV-4 infection was 22.3{\%} (33/148), while post-partum metritis was 33.8{\%} (48/142). Strong association was found between BoHV-4 infection and lactation number, lactation stage and post-partum metritis. The odds of being positive for BoHV-4 infection were 6.47 times (95{\%} CI 1.17–35.92; P < 0.05) and 6.79 times (95{\%} CI 1.19–38.55; P < 0.05) higher for cows in the fourth and fifth lactation, respectively, compared with cows in the first lactation. BoHV-4 was 8.27 times more likely (95{\%} CI 1.43–47.94; P < 0.05) among cows in the early stage of lactation (0–120 days) compared with those in late lactation (>240 days). Cows with post-partum metritis were 4.51 times (95{\%} CI 1.27–16.02; P < 0.05) more likely to test positive for BoHV-4 infection compared with those without post-partum metritis. Phylogenetic analysis of BoHV-4 based on sequencing of glycoprotein and thymidine kinase (TK) genes revealed genetic variability of the virus with glycoprotein B genotype 1 and TK genotype 2 as being dominant genotypes. The reported high genetic variability of BoHV-4 indicates the possibility of co-infection with multiple genotypes.",
keywords = "Bovine herpes virus type 4, California, dairy cows, phylogenetic analysis, prevalence",
author = "D. Areda and Munashe Chigerwe and Beate Crossley",
year = "2018",
month = "4",
day = "10",
doi = "10.1017/S0950268818000791",
language = "English (US)",
pages = "1--9",
journal = "Epidemiology and Infection",
issn = "0950-2688",
publisher = "Cambridge University Press",

}

TY - JOUR

T1 - Bovine herpes virus type-4 infection among postpartum dairy cows in California

T2 - risk factors and phylogenetic analysis

AU - Areda, D.

AU - Chigerwe, Munashe

AU - Crossley, Beate

PY - 2018/4/10

Y1 - 2018/4/10

N2 - The aims of this study were to determine the prevalence and associated risk factors of bovine herpes virus type-4 (BoHV-4) infection and describe the genetic characteristics and predominant genotypes of the virus in Yolo and Tulare counties, California. A cross-sectional study involving multi-stage sampling technique was used. One hundred and forty-eight post-partum cows were enrolled from 11 dairy farms. Uterine/vaginal samples were collected and tested for BoHV-4 and other co-infecting viruses using real-time PCR. Data were analysed using multilevel logistic mixed-effect model. Phylogenetic analysis of 10 BoHV-4 isolates was conducted by targeting three open reading frames (ORF3, ORF8 and ORF 22) of the viral genome. The prevalence of BoHV-4 infection was 22.3% (33/148), while post-partum metritis was 33.8% (48/142). Strong association was found between BoHV-4 infection and lactation number, lactation stage and post-partum metritis. The odds of being positive for BoHV-4 infection were 6.47 times (95% CI 1.17–35.92; P < 0.05) and 6.79 times (95% CI 1.19–38.55; P < 0.05) higher for cows in the fourth and fifth lactation, respectively, compared with cows in the first lactation. BoHV-4 was 8.27 times more likely (95% CI 1.43–47.94; P < 0.05) among cows in the early stage of lactation (0–120 days) compared with those in late lactation (>240 days). Cows with post-partum metritis were 4.51 times (95% CI 1.27–16.02; P < 0.05) more likely to test positive for BoHV-4 infection compared with those without post-partum metritis. Phylogenetic analysis of BoHV-4 based on sequencing of glycoprotein and thymidine kinase (TK) genes revealed genetic variability of the virus with glycoprotein B genotype 1 and TK genotype 2 as being dominant genotypes. The reported high genetic variability of BoHV-4 indicates the possibility of co-infection with multiple genotypes.

AB - The aims of this study were to determine the prevalence and associated risk factors of bovine herpes virus type-4 (BoHV-4) infection and describe the genetic characteristics and predominant genotypes of the virus in Yolo and Tulare counties, California. A cross-sectional study involving multi-stage sampling technique was used. One hundred and forty-eight post-partum cows were enrolled from 11 dairy farms. Uterine/vaginal samples were collected and tested for BoHV-4 and other co-infecting viruses using real-time PCR. Data were analysed using multilevel logistic mixed-effect model. Phylogenetic analysis of 10 BoHV-4 isolates was conducted by targeting three open reading frames (ORF3, ORF8 and ORF 22) of the viral genome. The prevalence of BoHV-4 infection was 22.3% (33/148), while post-partum metritis was 33.8% (48/142). Strong association was found between BoHV-4 infection and lactation number, lactation stage and post-partum metritis. The odds of being positive for BoHV-4 infection were 6.47 times (95% CI 1.17–35.92; P < 0.05) and 6.79 times (95% CI 1.19–38.55; P < 0.05) higher for cows in the fourth and fifth lactation, respectively, compared with cows in the first lactation. BoHV-4 was 8.27 times more likely (95% CI 1.43–47.94; P < 0.05) among cows in the early stage of lactation (0–120 days) compared with those in late lactation (>240 days). Cows with post-partum metritis were 4.51 times (95% CI 1.27–16.02; P < 0.05) more likely to test positive for BoHV-4 infection compared with those without post-partum metritis. Phylogenetic analysis of BoHV-4 based on sequencing of glycoprotein and thymidine kinase (TK) genes revealed genetic variability of the virus with glycoprotein B genotype 1 and TK genotype 2 as being dominant genotypes. The reported high genetic variability of BoHV-4 indicates the possibility of co-infection with multiple genotypes.

KW - Bovine herpes virus type 4

KW - California

KW - dairy cows

KW - phylogenetic analysis

KW - prevalence

UR - http://www.scopus.com/inward/record.url?scp=85045135060&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85045135060&partnerID=8YFLogxK

U2 - 10.1017/S0950268818000791

DO - 10.1017/S0950268818000791

M3 - Article

C2 - 29633683

AN - SCOPUS:85045135060

SP - 1

EP - 9

JO - Epidemiology and Infection

JF - Epidemiology and Infection

SN - 0950-2688

ER -