In Florida, cockroach allergens stick around year-round—even after the roaches...

https://astro-wiki.win/index.php/What%E2%80%99s_the_Simplest_Way_to_Figure_Out_if_Roaches_Are_Part_of_Our_Asthma_Problem%3F

In Florida, cockroach allergens stick around year-round—even after the roaches are gone—and can worsen asthma symptoms. These tiny particles hide in places like behind the fridge or under mulch