polyvalent bacterial vaccine

例句：

1. 1. The vaccine is designed to protect against multiple pathogens.
   这种疫苗旨在保护免受多种病原体的攻击。
2. 2. Polyvalent antibodies can recognize and neutralize a wide range of antigens.
   多价抗体可以识别并中和广泛的抗原。
3. 3. Polyvalent vaccines are more effective in preventing diseases than single-component vaccines.
   多价疫苗在预防疾病方面比单一成分疫苗更有效。