viral disease

例句：

1. 1. Viral diseases can be spread through the air or by direct contact with infected individuals.
   病毒性疾病可以通过空气传播或通过与感染者直接接触传播。
2. 2.The new vaccine has shown promising results in preventing viral diseases.
   新疫苗在预防病毒性疾病方面显示出了令人鼓舞的结果。
3. 3.The virus is responsible for a wide range of viral diseases, including hepatitis and encephalitis.
   这种病毒负责引起一系列病毒性疾病，包括肝炎和脑炎。