reassortment
Noun
Meaning
The act or result of arranging in a new order or layout.
(biology) The mixing of genetic material of two competing viruses infecting the same cell.
Source: en.wiktionary.orgSynonyms
Examples
Dr Tang says that academics are “still trying to understand” how a new virus is able to “replace the previous virus”, an occurrence that happens as the result of a “reassortment event”.
This means they’re the most likely host in which reassortment occurs.