The Andromeda Strain

You bring him into a ridiculously well protected laboratory, underground the Nevada desert. He seems to be immune due to a high PH level in his blood. After a series of tests, you manage to find that it does not have DNA, RNA, or any proteins. You deem it an alien microbe.

You wait one day, to take a rest and think about next steps.

When you come back, you see a hole in the canister, and the virus has escaped. It has evolved to become non-lethal in the process, but who knows how long that will last?