I litterally have close to 20 kinds of edible and gourmet mushrooms at my house, dehydrated. One of them even cures the chicken pocks - herpes - or whatever bullshit scientist do this do that. But yeah, no bs, reportedly cures herpes - which supposedly has no cure.
It's called gypsy mushroom. Rozites caperata.
You're mistaking cures for treatments. Eating the mushrooms may treat you from a virus when it flares up, but every virus you have ever had is kept in you. Dormant or inactive but can strike again if your immune system is compromised.
The trick is to make sure your immune system is always on top of its game. But remember, getting sick is part of keeping a good immune system. Like muscles you dont work out that atrophy. Also keeping a sterile existence (being a germaphobe) can lead to your immune system shall we say 'getting bored' and leading to the chance of attacking your own body leading to diabetes or other diseases
This is why letting children play in the dirt is actually a good thing