Enzootic bovine leukosis: Report of eradication and surveillance measures in Italy over an 8-year period (2005–2012)

Maresca, Carmen; Costarelli, S.; Dettori, Annalisa; Felici, Andrea; Iscaro, Carmen; Feliziani, Francesco

doi:10.1016/j.prevetmed.2015.02.024

Cited by 30 publications

(22 citation statements)

References 8 publications

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“…But in a study in four provinces of Cambodia sero-prevalence of the BLV was between 0 to 16.8% (45) and , in four township of Myanmar a prevalence of 9.1% was found (46), being both lower than this research. Nevertheless, in Europe the prevalence is lower than this research, for Italy (47), reported an animal sero-prevalence of 0.015%. In Finland (10), for the year 2001 reported a prevalence of BLV of 0%, and for Portugal until the year 2005 a seroprevalence was of 0.036% (48).…”

Section: Discussioncontrasting

confidence: 60%

Sero-prevalence of bovine Leukemia virus in cattle from Caquetá state, Colombia

Delgado

Calderón

Valencia³

et al. 2019

Rev Colombiana Cienc Anim. RECIA

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Bovine Leukemia Virus (BLV) is the agent of enzootic bovine leukosis (EBL), this disease is a neoplasm of lymphatic tissue in bovine species. The aim of this article was determinate the prevalence of bovine leukemia virus in dual-purpose cattle from nine municipalities that produce the 98% of milk in the Caquetá state, Colombia. Blood samples were collected in 100 herds dedicates to dual purpose cattle, obtained blood serum from 1000 animals, of which 893 corresponding to cows. Indirect Elisa test for detection of antibodies anti-GP51 of BLV was performance and the positive cases were considered if the serum-to-positive ratio with percentages of M/N lower than 40%. Categorized data were analyzed by contingency tables and ANOVA at the significant level of p<0.05 by DGC test was performed. The overall sero-prevalence of BLV in Caquetá state was of 25.18% (95%, CI: 21.9-28.46%), in males 26.25% and females 25.37% respectively. At municipal level the sero-prevalence varied of 7.12 to 41.81%. The prevalence of BLV at herd level was of 67% (95%, CI: 57.24-76.76%). In conclusion, the sero-prevalence of BLV in the dual-purpose livestock system over 36 months of age in Caquetá state is moderate, do not exist statistical difference between sero-prevalence of cows and bulls. At level of herds the prevalence of BLV is high. Improving strategies of control and managements in the herds, as well as implement policies of sanitary management are necessary.

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Section: Discussioncontrasting

confidence: 60%

Sero-prevalence of bovine Leukemia virus in cattle from Caquetá state, Colombia

Delgado

Calderón

Valencia³

et al. 2019

Rev Colombiana Cienc Anim. RECIA

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“…Although EBL has been eradicated in certain European countries (22)(23)(24), it is still prevalent worldwide, including in Japan where the numbers of EBL cases have increased recently. A nationwide survey in Japan conducted from 2009 to 2011 indicated a high seroprevalence of BLV in both dairy and beef cattle (40.9% and 28.7%, respectively) (25).…”

mentioning

confidence: 99%

Identification of an Atypical Enzootic Bovine Leukosis in Japan by Using a Novel Classification of Bovine Leukemia Based on Immunophenotypic Analysis

Nishimori

Konnai

Okagawa

et al. 2017

Clin Vaccine Immunol

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Bovine leukemia is classified into two types: enzootic bovine leukosis (EBL) and sporadic bovine leukosis (SBL). EBL is caused by infection with bovine leukemia virus (BLV), which induces persistent lymphocytosis and B-cell lymphoma in cattle after a long latent period. Although it has been demonstrated that BLV-associated lymphoma occurs predominantly in adult cattle of >3 to 5 years, suspicious cases of EBL onset in juvenile cattle were recently reported in Japan. To investigate the current status of bovine leukemia in Japan, we performed immunophenotypic analysis of samples from 50 cattle that were clinically diagnosed as having bovine leukemia. We classified the samples into five groups on the basis of the analysis and found two different types of EBL: classic EBL (cEBL), which has the familiar phenotype commonly known as EBL, and polyclonal EBL (pEBL), which exhibited neoplastic proliferation of polyclonal B cells. Moreover, there were several atypical EBL cases even in cEBL, including an early onset of EBL in juvenile cattle. A comparison of the cell marker expressions among cEBL, pEBL, and B-cell-type SBL (B-SBL) revealed characteristic patterns in B-cell leukemia, and these patterns could be clearly differentiated from those of healthy phenotypes, whereas it was difficult to discriminate between cEBL, pEBL, and B-SBL only by the expression patterns of cell markers. This study identified novel characteristics of bovine leukemia that should contribute to a better understanding of the mechanism underlying tumor development in BLV infection.

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“…According to previous studies, the cattle-level prevalence is 38.6% in the United States of America 2) , 42.3% in Peru, 27.9% in Chile, 30.7% in Bolivia, 54.7% in Paraguay, 77.4% in Argentine 26) , 0.04% in Italy 16) and 9.1% in Mongolia 21) . In Japan, EBL is a notifiable disease and has been subject to passive surveillance since 1997 17) .…”

Section: Introductionmentioning

confidence: 87%

Assessment of Hematological Parameters and Carcass Weight in Bovine Leukemia Virus Infection in Slaughtered Beef Cattle

Notsu

Hashida

Mitoma

et al. 2018

JVE

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Most bovine leukemia virus (BLV)-infected cattle do not have clinical signs (aleukemic AL), but some develop persistent lymphocytosis (PL) and B-cell lymphosarcoma (enzootic bovine leucosis [EBL]). BLV infection is a well-known cause of chronic wasting disease, which is associated with a reduction in milk productivity and immunity in dairy cattle. However, the effect of BLV infection on beef cattle is not clear. The objective of this study was to investigate the effect of BLV infection on the productivity of slaughtered beef cattle. A total of 997 blood samples were collected from cattle in 2 slaughterhouses in Miyazaki prefecture, Japan. BLV-antibodies were tested in these cattle＇s blood samples using enzyme-linked immunosorbent assay (ELISA), to identify BLVinfected cattle. We compared blood parameters and carcass weight between BLV ELISA-positive and ELISA-negative cattle in two age groups : young (≤ 60 months) and elder (> 60 months) groups. The results showed that the proportion of ELISA-positive cattle in the young and elder groups were 22.8% and 24.9%, respectively. The number of white blood cells (WBCs) and lymphocytes in ELISA-positive cattle was significantly higher than that in ELISA-negative cattle in the young group. In addition to the number of lymphocytes, the number of monocytes and neutrophils were also significantly higher in BLV ELISA-positive cattle than in ELISAnegative cattle in the elder group. There was no significant difference in the carcass weight between ELISA-positive and ELISAnegative cattle in both groups. The results of this study suggest that BLV infection has an effect on the host immune response in beef cattle.

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Enzootic bovine leukosis: Report of eradication and surveillance measures in Italy over an 8-year period (2005–2012)

Cited by 30 publications

References 8 publications

Sero-prevalence of bovine Leukemia virus in cattle from Caquetá state, Colombia

Sero-prevalence of bovine Leukemia virus in cattle from Caquetá state, Colombia

Identification of an Atypical Enzootic Bovine Leukosis in Japan by Using a Novel Classification of Bovine Leukemia Based on Immunophenotypic Analysis

Assessment of Hematological Parameters and Carcass Weight in Bovine Leukemia Virus Infection in Slaughtered Beef Cattle

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