He was, of course, using the metaphor of biodiversity to refer to the fact that the vast majority of computer viruses and malware targeted Windows systems at that time, something that is still true today. Very few threats targeted the Apple operating system, and because of its design the system was (and is) more resistant to such attacks.
Every student of biology—which naturally includes doctors and health care workers—ought to be aware of the advantages of biodiversity in natural systems. Biodiversity brings resilience to species and to entire ecosystems. Variations in members of a species make it more likely that some will survive to propagate. Variations across species that inhabit an ecosystem make it more likely that the system will survive as a coherent unit when some, but not all of a particular species die out.
Of course, computer networks are not biological systems (unless you include the human operators). But they suffer some of the same obvious vulnerabilities. When you look at the share of operating systems worldwide for all platforms there appears to be at least some diversity with two major systems, Android and Windows vying for first place.
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