During November 14 th to December 14 th,2015,an acute death of unknown origin occurred in cattle purchased from another county in several villages of Heilongjiang province. These diseased cattle mainly showed respiratory symptoms and the time periods of morbidity to death were various(ranging from several hours to a couple of days). By autopsy diagnosis,severe pneumonia was found. In order to fi nd out the cause and provide suggestions for its prevention and control,an investigation was conducted by fi eld ...
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