There has been a LOT of talk in the media, various forums, twitter, etc, about "herd immunity" in regards to the corona virus pandemic.
The idea, basically, is that if enough people catch and subsequently become immune to the virus, the virus will "look around" for new hosts within the population, as some have suggested, and finding none available, recede and eventually die out.
That "looking around" suggests viruses are alive, seeking to reproduce like bacteria and fungi.
Modern science is still almost entirely based on 17th century concepts that physical movement is perfectly smooth and continuous.
This continuity of movement implies continuity of operation (of the world we experience) which naturally induced the perception that our universe (and our bodies) operated like a clockwork machine. This machine-world view was the impetus for the Industrial Revolution which resulted in many beneficial technologies (aircraft, automobiles, etc).