I'm DebinCR, meaning Costa Rica

[Kiki]

No testing - he watched a video of the raspy chick & prescribed Virkon fumigation, but I've never done it. I think I'll do OK, let the coop dry for a few hours before letting any residents back in.

Virkon is a good thing to kill viruses and disease in a coop but it's not going to kill it in the bird.
Did he suggest antibiotics?

Can you post the video here?

 

[007Sean]

Howdy Welcome to Backyard Chickens.
Enjoy your time here!

 

[cmom]

You are lucky to have a vet for your birds. Here the vets don't do birds. Good luck with your birds and have fun...

 

[416bigbore]

Hello and welcome to BYC. You found an Amazing Poultry Community to be a part of with many knowledgeable members who are willing to help you along your journey with any questions you may have. Enjoy