According to the first precept Buddhists refrain from killing living beings. Abortion is seen as killing. Vaccine ingredients- what are they? For thorough research please see avn.org.au. What we know is that some ingredients in the vaccines are produced and/or extracted from aborted fetus.
The abortion industry has become a massive economy these days. If a monk was to receive an offering of human flesh the monk is obliged to refuse it. What is the difference then with vaccines produced from aborted fetus?
This is a discussion that has not been openly and thoroughly discussed in the Sangha nor the Buddhist community generally.
Time to have a look.