Usedtabe, diseases could not cross species barriers, never mind kingdom barriers. Now, they're crossing super-kingdom barriers.
...Some of you may remember my fascination with the actin protein, and its potential power if misfolded...
www.f1000biology.com...
Hidden Jewel: Are eukaryotic genes spreading in prokaryotic populations?
Two Faculty Members have selected for evaluation a paper identifying a surprising case of horizontal gene transfer (HGT) of eukaryotic cytoskeletal
proteins to a prokaryotic cyanobacterium.
Mohan Balasubramanian (National University of Singapore, Singapore), a Faculty of 1000 Biology Member for Cell Biology, remarks: "This is the
first report of a true actin (i.e. not MreB or ParM related) in a bacterium".
Debashish Bhattacharya (University of Iowa, USA), a Genomics & Genetics Faculty Member, also commented on the paper, saying: "The fact that this rare
direction of transfer was detected in a cultivated sample and in limited analyses of natural extracts suggests that eukaryote to prokaryote HGT may
occur more frequently in nature than previously thought."
FYI - There are six kingdoms of living things, divided into two major groups or super-kingdoms called Prokaryotes and Eukaryotes.
The Six Kingdoms of Life
Life goes on. lol