It Was Responsible
Once they have tested the plant, they noticed that everything is fine with it. There was nothing unusual. It was a rare plant but that’s it. Then they tested it more and more. Turns out the virus lived on the leaves of the plant. It was easy to catch the virus and it would infect the person within days.
The virus was the same one that affected Roy. But he didn’t even touch the plant? Well, the plant had an unusual capability of moving certain parts that could launch the virus into the air when Susan and Roy passed by.