Vinegar, used full strength, is an effective, but inexpensive disinfectant. Wipe down all items that may have been exposed to airborne FMD virus. Scrape away all mud, debris or soil from shoes. Disinfect all shoe surfaces with vinegar. The FMD virus can live in the soil, organic material and mud for an extended period of time.
Clean shoes reduce risk.
If this isn't practical, clean your clothing as soon as possible when you get home. Live FMD virus can contaminate clothing. Don't risk exposing U.S. livestock or wildlife to disease by wearing clothes that haven't been washed or cleaned. Aside from being illegal to bring into the country, meat, unpasteurized cheese, and unprocessed hides or animal products can harbor live FMD virus. Declare food products, and the Customs or USDA official can properly dispose of them.