IIRC one of the hurricanes that hit Florida - Andrew? - clobbered an import facility and that's the source of a lot of the Florida burms. Many importers don't treat for internal parasites. So, it would make sense that any burms released before being sold and treated would have unfortunately spread any parasites they were carrying at the time.
https://amp.floridatoday.com/amp/3435198002
https://amp.floridatoday.com/amp/3435198002