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Epidemiology of the Important Animal Diseases and Evaluation of Control Measures  

Update Date: [2013-11-14]
No.:47

Reporton.
AHRI report No.47
Topic
Epidemiology of the Important Animal Diseases and Evaluation of Control Measures
Department
Animal Health Research Institute, Council of Agriculture, Executive Yuan
Author
SH Lee, KR Tsai, JC Chang, YC Tu, MC Chang,LJ Ting, MS Lee,
YP Chen, WC Hsu, WC Chuang, CL Chen, MH Jong,
Summary
In 2011, a total number of 3,392 cases were submitted to the Animal Disease Diagnostic Center of Animal Health Research Institute (AHRI) for important animal disease diagnosis, surveillance, and research. By using the pathological, microbiological and epidemiological methods, we could quickly diagnose the animal diseases and provide helpful advice to the animal producers for disease control. We diagnosed 342 porcine cases and found that porcine circovirus type 2 infection (PCV2), porcine reproductive and respiratory syndrome (PRRS), combined with bacteria secondary infection were the most disturbing problems in pig. It is noticeable that the prevalent age of PRRS was significant decreasing to nursery pig period and the lesion of PCV2 associated pneumonia became very mild after massive PCV2 vaccination. Weight loss, mastitis, arthritis and respiratory problems were the most common clinical signs seen in cattle necropsy cases. We detected Mycobacterium paratuberculosis in most weight loss cattle. P. multocida and Mannheimia haemolytica were detected in lung tissue from some cattle. We had established the assessment techniques to detect PR-gE antibody from sow milk. The positive rate of PR-gE antibody in 2011 was 39.26% (223/568) and we plan to continue doing the surveillance program and PR disease control until elimination of PR in Taiwan. Duck virus hepatitis (DVH) study was performed in November. After injection of DVH virus, it could be detected in liver in early stage and then migrated to pancreas. The mortality rate was highest during 36 ~ 72 HPI and could recover large amount of virus particles in liver, pancreas, and gallbladder. Immunohistochemistry (IHC)and in situ Hybridization (ISH) will be done in the future for further explore of pathogenesis.
Keyword
important animal diseases, diagnosis, pathology, epidemiology, disease control