Source(s): immigration nationality directorate border immigration uk border agency reference no: https://tinyurl.im/UEZro.
About 99% of mouse genes have a homolog in the human genome, and for 80% of these genes, the best match in the human genome has, in turn, its best match against the orthologous mouse gene in the conserved syntenic interval.
And perhaps the best way we can get a handle on that is by actually looking at the genetic material in these viruses. And what we can tell from that if we look at the virus and the genes that go into it, a lot of these genes are very similar to viruses we've seen in North American pig populations over the last decade.