It is difficult to develop a scenario for the state of Texas where any occurrence of primary respiratory infection with the anthrax organism would be expected. However, Laredo, Texas is the largest inland port in North America. Ten thousand tractor trailer trucks cross the Mexico-United States border every day. If a trailer contained a cargo of anthrax infected animal hides, it is feasible that the truck driver and or illegal passengers riding in the trailer could be exposed through the respiratory route. This fictional example would certainly represent unexpected and unnatural circumstances.