Species are surrounded by other species (often sharing the same body), and therefore may interfere with one another’s fitness.
It’s another example of a paper that sounds like it could have been written by a proponent of intelligent design.
William Dembski offers insightful analysis about how we could go about determining whether the virus was designed.
For my part, I think it’s better to approach the data without assumptions and to let the evidence speak for itself.
Virus detection in computer programs is primarily implemented using a signature-based technique.