The artificial infection experiment showed that 80 percent of strains (8/10) were highly virulent and the disease was easily reproduced by subcutaneous, intramuscular or webfoot injection.
人工感染试验表明，80%（8/10）菌株毒力
，皮下、肌肉、足蹼3种途径均易复制该病；
动
；
间有薄膜的动The artificial infection experiment showed that 80 percent of strains (8/10) were highly virulent and the disease was easily reproduced by subcutaneous, intramuscular or webfoot injection.
人工感染试验表明，80%（8/10）菌株毒力，皮下、肌肉、足蹼3种途径均易复制该病；
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