If you see one cockroach, then there is likely ten to a hundred hiding in your house out of sight. Roaches can trigger allergies from their saliva, skin and droppings, and is the leading trigger of allergies and asthma attacks in Canada. Children with asthma are most vulnerable. Keeping your home clean is the number one way to make your house less appealing to roaches, as they are quite adaptability. Garbage cans should always be closed, the kitchen should be spic and span, and pet food should always be put away and stored in hard plastic. Vacuuming is also very important, at least twice a week.
https://gogreenpestcontrol.ca/roaches-and-roach-allergies/
https://www.linkedin.com/pulse/roaches-roach-allergies-randy-bilesky/?published=t