A conjugate vaccine is a type of subunit vaccine which combines a weak antigen with a strong antigen as a carrier so that the immune system has a stronger response to the weak antigen.
Vaccines are used to prevent diseases by invoking an immune response to an antigen, part of a bacterium or virus that the immune system recognizes.[2] This is usually accomplished with an attenuated or dead version of a pathogenic bacterium or virus in the vaccine, so that the immune system can recognize the antigen later in life.[2]
Most vaccines contain a single antigen that the body will recognize. However, the antigen of some pathogens does not elicit a strong response from the immune system, so a vaccination against this weak antigen would not protect the person later in life. In this case, a conjugate vaccine is used in order to invoke an immune system response against the weak antigen. In a conjugate vaccine, the weak antigen is covalently attached to a strong antigen, thereby eliciting a stronger immunological response to the weak antigen. Most commonly, the weak antigen is a polysaccharide that is attached to strong protein antigen. However, peptide/protein and protein/protein conjugates have also been developed.[3]
- ^ "Immunization: You Call the Shots". www2.cdc.gov. Archived from the original on 2010-06-03. Retrieved 2018-11-29.
- ^ a b "Understanding How Vaccines Work | CDC". www.cdc.gov. 2018-10-18. Archived from the original on 2020-01-02. Retrieved 2018-11-29.
- ^ Rappuoli, Rino.; Bagnoli, Fabio., eds. (2011). Vaccine design : innovative approaches and novel strategies. Norfolk, UK: Caister Academic. ISBN 9781904455745. OCLC 630453151.