AD virus

例句：

1. 1. The outbreak of the new COVID-19 strain is a major concern for public health authorities.
   新型COVID-19毒株的爆发是公共卫生当局的一个主要关注点。
2. 2. Researchers are trying to understand the genetic makeup of this particular AD virus.
   研究人员正在试图理解这种特定AD病毒的遗传构成。
3. 3. The discovery of this new virus has raised questions about the effectiveness of current vaccines.
   这种新病毒的发现引发了对当前疫苗有效性的疑问。