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）菌株毒力强，皮下、肌肉、 足 蹼 3 种 途径均易复制该病；