I just want to make 1 more comment; the reality is I could talk about vaccines until I'm blue in the face b/c, gosh darn it, I love what they have done for humankind.
As a Public Health Nurse, I received a lot of good training on the topic at hand, so, when in doubt, I recommend going to your local public health clinic. I was a Team Lead for immunizations & had the opportunity to write a grant & start a travel immunization clinic, so I would audit records, including my own. If I spotted a missed opportunity to vaccinate or an administration error, I was allowed to contact the patient, apologize, & offer a convenient time for them to come back to the clinic for services. How often does that happen in the private sector? Also, we were a resource for private providers, keeping them up to date of ACIP recommendations. This started b/c of the frequency with which we observed administration errors in the state registry.
If someone ends up with a wrong-site injection, they may need to be re-vaccinated, depending on the site & vaccine. immunize.org & CDC.gov/vaccines have info on this.
My point is, when in doubt, reach out to your local or state health department, whether for a patient or yourself. I also contacted the CDC on several occasions with questions prior to immunizing patients with complicated situations (e.g., recently finished chemo/wants live vaccine/how long should I wait, liver failure patients/Should I use Twinrix or standard HepA/B vaccine, etc.). I always received a prompt, thorough response too.
Quality matters, & I think we all agree there is much more to vaccines than sticking a needle in an arm. Just wanted to share my thoughts. Enjoyed reading yours.