3 adjectives to describe inoculation

He said that nothing would induce them to divulge it, but that he suspected it consisted in gradual inoculation with the venom itself.

They ought to get up and make a public row about it, to insist on compulsory inoculation for everybody whether they like it or not.

But if you want to see with your own eyes and close at hand what timely inoculation will accomplish, look at the English.

3 adjectives to describe  inoculation