Spreading infected slurry can lead to airborne spread. Venting on milk tankers in transit. Nostrils of humans for up to five days. One human can spread an infective dose to another. There are very sound reasons as to why the feet and vehicles wheels need special attention.
Hands are likely to be washed and clothes changed.
The incubation period between exposure and showing symptoms of FMD is not less than two days and not more than 14 days. Most outbreaks are seen three to five days after infection. If an animal does not show symptoms within 21 days of the feared contact or exposure then it is assumed to be in the clear. The FMD virus is easily killed by acids, and also by strong alkalis. The acids and alkalis should never be mixed.