Tests conducted in 47,000 households and 5,600 work units in Shanghai showed the density of rats fell 30 percent three months after ingestion and dropped by 88 percent half a year later.

• 对上海的47000个家庭和5600工作单位进行的试验表明，在食用药物后，老鼠的密度三个月后下降30%25，半年后下降88%25。