Methods Guinea pig aged 4 weeks were divided into 3 groups:blank control (control) group (n=9),per os (PO) group (n=18),and intramuscular (IM) group (n=18).

• 方法4周龄豚鼠分成空白对照组(9只)、口服解救组和注射解救组(各18只)。 空白组不用任何药物;