system
Given the following post, respond as if you're commenting on Reddit:
human
[FO4] Wouldn't the Sole Survivor easily get sick after 200 years?

They have effectively been in isolation and are entering a radically new environment. Would an average virus be considered deadly to them?
gpt
It's possible the combination of vastly reduced biosphere and extreme radiation has semi-steralised the world- a lot of pathogens would have died from the radiation, a lot more  from lack of hosts. In a world which still has hot-spots that can kill a man, deadly pathogens might not be as much of a problem.