Yes, there's nasally administered flu vaccines, and Covid as well, I believe. For a long time jet injectors were used for vaccination, which is an injector, but

Yes, there's nasally administered flu vaccines, and Covid as well, I believe. For a long time jet injectors were used for vaccination, which is an injector, but not a needle (but have a risk of cross-contamination). Looks like there's an oral vaccine for rotavirus as well, which I just learned about. It makes sense because that's the route of infection for this virus. https://www.cdc.gov/vaccines/hcp/admin/administer-vaccines.html https://www.cdc.gov/vaccines/hcp/admin/administer-vaccines.h...