You bet they do. Flies are one of the filthiest pests on the planet, and they don't need to bite you or even leave waste behind to transmit dangerous pathogens. All they have to do is land on something that you might touch or ingest to put you at risk. According to the NLM, even a common housefly can carry more than a million bacteria. They've been proven to transmit more than 65 diseases to humans, including dysentery, typhoid fever, E. coli, shigella, salmonella, cholera, and polio. Flies pose a serious health risk to our pets and livestock as well.

Fruit flies are annoying, but you can outwit them. First, don't leave your ripening fruit out and accessible. Use a container like a glass dome, which keeps the flies off and your fruit fresher for longer. Keep your counters and sinks clean and your trash tightly covered. You should also make sure drains are kept clean. Vinegar traps may also help. Pour a cup of apple cider vinegar into a jar, add a few drops of dish soap, and set the bowl out. The vinegar attracts the fruit flies, but the dish soap prevents them from escaping the bowl. 

Earwigs usually live outdoors in damp areas, but they often move inside when conditions are dry or cold. While they don’t damage structures, they can be a nuisance when they gather in large numbers.

Pantry pests, such as beetles and moths, are drawn to stored foods like flour, rice, grains, and pet food. Once inside, they can contaminate large amounts of food quickly.

Stink bugs often enter through small cracks around windows, doors, and siding, especially during cooler months. Once inside, they can become a nuisance and release an unpleasant odor when disturbed.

Cockroaches can contaminate food, trigger allergies, and spread bacteria. They reproduce quickly and hide in kitchens, bathrooms, and drains, making them difficult to eliminate without professional treatment.

Springtails gather in these areas because they rely on consistently damp environments, and the moisture around drains, shower floors, and leaky fixtures provides the humidity they need to survive.

Crickets move indoors in search of warmth, light, and food sources such as fabrics, stored items, or crumbs, especially during cooler months when outside temperatures drop.

Millipedes do not damage structures or belongings, but they can become a nuisance when large numbers migrate indoors during periods of heavy rain or drought while searching for moisture.

Sowbugs and pill bugs enter structures when outdoor moisture levels change, often seeking damp indoor areas such as crawlspaces, unfinished basements, and laundry rooms where humidity is consistently higher.

Centipedes are drawn to basements because they thrive in high-moisture environments and seek out dark, humid spaces where they can hide and hunt for smaller insects.