Yes, I know. I was using "cross breed" as a short cut expression to express the concept of what happens when 2 virions get into the same cell and everything goes just right (or wrong) and they swap a few stretches of RNA/DNA. The same process over which there was a bunch of hand-wringing during the recent Avian Flu scare.
PS I was too lazy to look up a generally accepted scientific nomenclature - but FWIW one appears to be 'hybridization'.