I also did it with Outbreak, Contagion, 28 Days Later and 28 Weeks Later titled When Mankind Battles Deadly Epidemics. Check out blog.
http://mrbrownsmoviemarathons.blogspot.com/2017/01/when-deadly-viruses-conquer-all.html
But those are only modern movies. Try these ones, starting with the two prior
versions of "I am Legend": "Last man on Earth" and "The Omega Man". follow it up with the original "The Crazies" and then the uncut version of "The Andromeda Strain". As an ancillary, and a marathon in itself, you could include "The Stand".
Andromeda Strain is one of my favs. I've.only seen it twice but thoroughly love it.
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