Yep, generally speaking, a lot of the old diseases are coming back to the USA.
http://www.dea.gov/pubs/pressrel/pr113005a.html
DEA Seizes Heroin-Laced Artwork
"Major Trafficking Organization Dismantled from Colombia to the Streets of Boston, MA"
November 30, 2005
http://www.dea.gov/pubs/pressrel/pr113005.html
"DEA Dismantles International Cocaine Trafficking Ring
Investigation Targets Criminal Drug Cartel with Ties to Two Countries"
November 30, 2005
To be precise, carried across the border from illegal invaders who were never vaccinated and arrive already infected. Multiple drug resistant tuberculosis and leprosy in particular.