cowpox virus

例句：

1. 1. The cowpox vaccine is highly effective in preventing the disease.
   牛痘疫苗在预防该疾病方面非常有效。
2. 2.The outbreak of swinepox has caused significant concern among farmers.
   猪瘟的爆发引起了农民们的广泛关注。
3. 3.Researchers are working on developing a new vaccine against cowpox.
   研究人员正在努力开发一种针对牛痘的新型疫苗。