Definition

1. Adjective (Tính từ):
   • (Medicine/Y học) Polyvalent: Describes a vaccine that is effective against multiple strains or types of a microorganism (e.g., bacteria, virus). It provides immunity to several diseases or several variants of the same disease with a single injection.

Usage Examples

• Adjective:
  • Vắc-xin đa liên thường được sử dụng trong chương trình tiêm chủng mở rộng. (Polyvalent vaccines are often used in expanded immunization programs.)
  • Bác sĩ khuyến nghị loại vắc-xin đa liên này vì nó bảo vệ chống lại ba chủng vi khuẩn khác nhau. (The doctor recommended this polyvalent vaccine because it protects against three different bacterial strains.)

Advanced Usage

• Technical/Medical Context: The term is almost exclusively used in medical, pharmaceutical, and public health contexts. It is a precise scientific term, not used in everyday conversation.
  • Nghiên cứu đang phát triển một loại vắc-xin đa liên mới chống lại bốn type virus cúm. (Research is developing a new polyvalent vaccine against four types of influenza virus.)

Variants and Related Words

• Đơn liên (Adjective - Monovalent): Describes a vaccine effective against a single strain or type of microorganism.
  • Trong một số trường hợp, vắc-xin đơn liên có thể được ưu tiên. (In some cases, a monovalent vaccine may be preferred.)

Synonyms

• Đa giá (Adjective): A less common synonym with the same meaning (polyvalent). "Đa liên" is the more standard term in Vietnamese medical terminology.
• Phối hợp (Adjective - Combined): Can sometimes be used in a broader sense for combined vaccines, but it is less specific than "đa liên," which emphasizes the "multi-strain" nature.

1. (y học) Polyvalent (of a vaccine)