Last time I was talking with my friend about people that visiting our farm from time to time. We agreed, that we need to minimize risk of diseases spread. Day after our conversation he prepared a nice baths for boots disinfection. It was really easy to make it.
You need to cut simple plastic tank (max 20 - 30 liters) in half and the job is almost done. Then you need only put inside some disinfection stuff, for example caustic soda. Right now every visitor need to go through disinfection baths.