Enzootic bovine leukosis accompanied by splenomegaly in an 8-month-old calf

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DOI: https://doi.org/10.12681/jhvms.22969
Keywords:
BLV virus juvenile splenomegaly
S. OKADA
Fukushima Prefecture Agricultural Mutual Aid Association, Fukushima, Japan
K. TAGAWA
Fukushima Prefecture Agricultural Mutual Aid Association, Fukushima, Japan
R. WADA
Fukushima Prefecture Agricultural Mutual Aid Association, Fukushima, Japan
Y. YAGUCHI
Northern Livestock Health Sanitation Center in Ibaraki Prefecture, Ibaraki, Japan
Y. KASHIMA
Northern Livestock Health Sanitation Center in Ibaraki Prefecture, Ibaraki, Japan
A. NISHIMORI
National Institute of Animal Health, National Agriculture and Food Research Organization, Ibaraki, Japan
Abstract

In this report, an 8-month-old calf (crossbred, Holstein × Japanese Black) developed fever and accompanied abomasum displacement. Blood chemical test showed remarkably high values of white blood cell count and heteromorphic lymphocytes. In pathological appraisal, enlarged splenomegaly and swelling of the lymph nodes were observed. Histopathological examination revealed invasion of tumor cells derived from B1 cells into systemic lymph nodes, liver and spleen. The provirus loads of bovine leukemia virus (BLV) was 1,439 copies per 10 ng DNA by using real time PCR. In conclusion, this case was diagnosed as bovine leukemia caused by BLV infection with a huge splenomegaly.

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