In Florida, cockroach allergens can linger long after the roaches disappear,...

https://future-wiki.win/index.php/What_Does_the_EPA_Say_About_Cockroaches_and_Asthma_Triggers%3F

In Florida, cockroach allergens can linger long after the roaches disappear, making asthma symptoms worse for many families year-round. Even a few hidden spots can cause problems because these allergens stick around in dust and crevices