Given your cats (very likely) strong immune system, and the fact that these URI viruses are omnipresent, your cats should do just fine :)

By washing your hands, clothes and shoes, you did the right thing. I hope the little kitten gets better

Your cats should be fine. One of my cats (as a kitten) had a very bad URI when I found her in the middle of the road. If I hadn't picked her up and took her to the vet the next day she might not have made it. At the time I didn't think to do any more than wash my hands after handling her (I didn't bring her in the house) and my other cat was fine.

I volunteer at a shelter and when upper respiratory viruses are making their rounds there I change my clothes before I get in my car, change my shoes and put my old clothes in a trash bag in my trunk. I obviously wash my hands but when I get home I immediately take a shower, wash my hair and throw my clothes in the washer and disinfect my shoes in virkon (bleach is deactivated by dirt). I probably don't need to take all those precautions but I don't want to take any chances. Cats are usually more suseptible to viruses if they are very young, very old or they are stressed. Your cats should be perfectly fine.

Poor kitten did not survive the night. I am heartbroken.
I am glad that I did what I could for her but it is still so very sad.
I stop at the farm weekly for produce and eggs so will take the safety precautions you both so generously have shared.
Mahalo

How sad for the poor little kitten :(
It is nice to know you cared and tried to rescue her, thank you for that...