PROLIFIC SPREAD. “Much like TEs, ERVs can continue to generate copies of themselves long after their horizontal introduction, either through germline reinfections or retrotransposition events. As a result, ERVs can rapidly spread in the host population and occasionally attain high copy numbers.” (TE = transposable elements, jumping genes); (ERV= Endogenous retroviruses).
https://www.sciencedirect.com/science/article/pii/S0959437X17301685