Do vaccines contain antibodies or antigens?

I am super confused- i thought that vaccines always had attenuated micro-organisms/ or just the pathogens in order to stimulate antibody production/ immune response. But in the AQA textbook it talks about injecting antibodies? Sorry if this question is stupid but help pleassssssssse!

Reply 1

earthworm

Antibodies can be used as drugs in their own right and are injected to stop the gut from breaking them down I think herceptin is an example but you would have to check. I think some vaccines can also be made from antibodies but you will have to check.