People who feel in danger of getting a particular disease may wish to consider a vaccine, but no-one should ever expect anyone else...

to ever receive one!

For that would be leaning, and leaning is a mortal sin that violates the #1 rule of God/good - don't interfere with anyone else's free will, but instead allow others to make their own decisions, unharrassed by you.

To act this way is to act in accord with God's laws and will deliver a good result spiritually and practically.