That's right. I'm a biosecurity specialist. I've been conducting research for 30 years in this field. I've consulted in 31 countries. I also work for a French agency as an expert on African swine fever. As you know, this virus recently hit Belgium.
African swine fever is a good example. Suppose a wild animal infected with African swine fever dies in April and you walk on the ground contaminated by its carcass in May. If you enter a pig farm without being careful, you have a fairly high chance of transmitting the pathogen to the farm.