For me it is people making food, supplements, and drugs. From their production to their quality department. Just full of people that have no idea what they are doing and making poor decisions. That’s not even to mention the management and owners.
Bonus: Home inspectors / mold remediation “professionals”. Absolutely clueless.
Get pest control there now. Give your cat a flea bath. Clean everything very well. I had to deal with this once and it was a months long ordeal. If you catch it fast, you might avoid this.