牛蛙自蝌蚪至亲蛙均易患此病。一年四季都可发生,尤其是水温为20℃时,病情最为严重。该病经口和皮肤接触传染。当水质恶化,蛙体受伤,营养不良,水温和气温温差大时,更易爆发流行,死亡率高。症状患病牛蛙精神不振,跳跃无力;头、嘴、下颌、腹部、腿及脚趾上多处充血、水肿,有时还有溃疡灶;临死前呕吐,拉血便。剖解病蛙,腹腔内有大量无色透明的腹水,肝、脾、肾肿大,肺 Bullfrog frogs are prone to the disease from tadpoles. Occurs throughout the year, especially when the water temperature is 20 ℃, the most serious condition. The disease is contagious through the mouth and skin. When the water quality is deteriorating, the frog body is injured, malnutrition, the temperature difference between water temperature and air temperature is large, the epidemic is more likely to break out and the mortality rate is high. Symptoms Bullfrog sick, jumped weakness; head, mouth, jaw, abdomen, legs and toes on multiple congestion, edema, and sometimes ulcers; vomiting before dying, pulling the blood. Systematic disease frog, abdominal a large number of colorless and transparent ascites, liver, spleen, kidney enlargement, lung