No. In specific cases, vaccines may not prevent you from contracting a disease. In general, vaccines do work. Even if they didn't work in your specific case.

No. In specific cases, vaccines may not prevent you from contracting a disease. In general, vaccines do work. Even if they didn't work in your specific case. Now, to bring this back around to being on-topic to the thread it's in, whether or not vaccines "work" is actually irrelevant. Either they do work and therefore stop the spread, or they don't work and they therefore don't stop the spread. A vaccine can not work without doing its job.