英语语法分析

Once heartworm tests are negative, the treatment is considered a success.

当心蠕虫测试为阴性，则认为治疗是成功的。

When one collector's dogs were seized, she fought to keep them from receiving heartworm treatment.

有一个收集者和人们打斗只是因为人们抓了她的狗去接受心丝虫的治疗。

Heartworm positive dogs should also be tested for the presence of microfilariae, usually using a concentrating filter test.

心蠕虫检测阳性犬应检查血中是否有仔虫，仔虫的检测通常使用集中过滤检测法。