Epidemiology of Natural Transmission of Bovine Leukemia Virus Infection PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Epidemiology of Natural Transmission of Bovine Leukemia Virus Infection PDF full book. Access full book title Epidemiology of Natural Transmission of Bovine Leukemia Virus Infection by Mark Cy Thurmond. Download full books in PDF and EPUB format.
Author: Mark Cy Thurmond
Publisher:
ISBN:
Category :
Languages : en
Pages : 334
Get Book Here
Book Description
Author: Mark Cy Thurmond
Publisher:
ISBN:
Category :
Languages : en
Pages : 334
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author: Marie-Liesse Lassauzet
Publisher:
ISBN:
Category :
Languages : en
Pages : 386
Get Book Here
Book Description
Author: Reginald Johnson
Publisher:
ISBN:
Category : Bovine leukemia virus
Languages : en
Pages : 514
Get Book Here
Book Description
Author: Reginald Johnson
Publisher:
ISBN:
Category : Bovine leukemia virus
Languages : en
Pages : 186
Get Book Here
Book Description
Author: Oscar Javier Benitez Rojas
Publisher:
ISBN: 9781392714973
Category : Electronic dissertations
Languages : en
Pages : 116
Get Book Here
Book Description
The chronic lymphoproliferative disorder, bovine leukosis, is caused by the deltaretrovirus bovine leukemia virus (BLV). Surveys indicate that 39% of the US beef cow-calf operations have at least one BLV-infected animal compared with 83% of dairy herds. Most BLV infected cattle remain asymptomatic and act as carriers of the virus while less than 5% progress to lymphosarcoma. There are limited studies on the impact of BLV in beef cattle. Understanding the impact as well as identifying important route of disease transmission in beef cattle enterprises is important to better design intervention strategies. The primary goals of the studies described in this this dissertation were to 1) further understand the risk of breeding bulls in the transmission of BLV and 2) to determine the effect of BLV on the survival of cattle in beef and dairy herds. We first determined BLV prevalence in breeding beef bulls and the presence of BLV provirus DNA in genital secretions (smegma and semen). In our study population, 44.6% of beef bulls were seropositive for BLV and 48.7% of herds had at least 1 BLV-infected bull. Bovine leukemia virus provirus DNA was detected in smegma samples of 4/54 (7.4%) BLV-seropositive bulls and represent a potential risk for the transmission of BLV from infected bulls to uninfected cows during natural service breeding programs. To evaluate this risk, we exposed BLV negative heifers to a BLV positive bull during a defined 38-day breeding period. Although BLV provirus was found in the smegma and blood of the BLV positive bull prior to and after the breeding period, we detected no evidence of seroconversion or presence of BLV provirus DNA in the blood of naive heifers. These results suggest that BLV infected bulls that are healthy and aleukemic may not be a significant risk of BLV transmission during a defined breeding season.We next evaluated the impact of BLV infection on beef and dairy cow' longevity within herds. The presence of BLV antibodies in blood was not associated with a change in beef cow longevity over 2 years monitoring period, but decreased survival was observed in cattle in which BLV infection had advanced clinically as indicated by a high BLV provirusload in blood. In dairy cows, we demonstrated that infected females lived significantly shorter than their negative herd mates and were at a 30% greater hazard of being culled compared with BLV negative cows. In summary, there is high prevalence of BLV in breeding beef bulls which could serve as a source of transmission both within and between herds. Based on our study results, the risk of transmission of BLV from healthy infected bulls to naive heifers is low when bulls are housed with heifers for a defined breeding period, but this scenario should not be considered without risk. BLV does not appear to have an impact on beef cow longevity, but in contrast, is associated with decreased longevity in dairy cows. These studies provide important information for supporting and designing risk based BLV control programs.
Author: Jane E. Sykes
Publisher: Elsevier Health Sciences
ISBN: 0323241948
Category : Medical
Languages : en
Pages : 928
Get Book Here
Book Description
Canine and Feline Infectious Diseases is a practical, up-to-date resource covering the most important and cutting-edge advances in the field. Presented by a seasoned educator in a concise, highly visual format, this innovative guide keeps you current with the latest advances in this ever-changing field. 80 case studies illustrate the clinical relevance of the major infectious disease chapters. Well-organized Major Infectious Diseases chapters break down content by etiologic agent and epidemiology, clinical signs and their pathophysiology, physical examination findings, diagnosis, treatment and prognosis, immunity, prevention, and public health implications. Over 80 case studies illustrate how the information provided can be applied in everyday practice. Logical approach to laboratory diagnosis guides you through all the steps needed to accurately diagnose and treat viral, bacterial, fungal, protozoal, and algal diseases. Practical protocols provided by expert clinicians guide you in the management of canine and feline patients suspected to have infectious diseases, including handling, disinfection, isolation, and vaccination protocols. Over 500 full color images – geographic distribution maps, life cycle drawings, and hundreds of color photographs – visually illustrate and clarify complex issues. Easy-to-understand tables and boxes make content quickly accessible, eliminating the need to sort through dense text for critical information in the clinical setting.
Author: A. Burny
Publisher: Springer Science & Business Media
ISBN: 9780898388466
Category : Medical
Languages : en
Pages : 314
Get Book Here
Book Description
This volume on enzootic bovine leukosis (EBL) and bovine leukemia virus (BLV) is the second in our series "Developments in Veterinary Virology". Each book in this series is devoted to a major virus disease of agricultural significance. The chapters in each volume are planned to supply information on a range of subjects from pathogenesis of the causative virus to vaccination, eradication, and rules regarding disease control. The present volume on enzootic bovine leukosis and bovine leukemia virus updates the reader on the disease and its causative agent and includes the nucleotide sequence of the BLV genome as well as data on its integration into the DNA of the tumor cell. Insights into diagnosis, veterinary legislation, and the economic aspects of EBL are also provided. Intense research conducted on EBL and BLV during the course of a decade is presented in a most concise and in-depth manner, so as to provide the reader with a comprehensive overview of this economically important disease of cattle. I wish to thank the editors, A. Burny and M. Mammerickx, as well as all the authors, for making this excellent book available at a stage when the knowledge on bovine leukemia virus will also contribute to our understanding of the virus causing human AIDS.
Author: Eunyoung Lee
Publisher:
ISBN:
Category :
Languages : en
Pages : 288
Get Book Here
Book Description
Author: Travis James Jewett
Publisher:
ISBN:
Category : Bovine leukemia virus
Languages : en
Pages : 110
Get Book Here
Book Description
