“Through August 2018, BSE surveillance has identified 26 cases in North America: 6 BSE cases in the United States and 20 in Canada. Of the 6 cases identified in the United States, one was born in Canada; of the 20 cases identified in Canada, one was imported from the United Kingdom.”
Centers for Disease Prevention and Control-CDC ( https://www.cdc.gov/prions/bse/bse-north-america.html)