Incidence
There are four species of cockroach which plague humanity (and they or their ancestors have been in existence for 350 million years): the German cockroach [Blatella germanica], which is found world-wide; the American cockroach; the Oriental cockroach [Blatta orientalis]; and the brown-banded cockroach.
Claim
Roaches, along with ants and rodents, cause vast amounts of anti-pest poisons with persistent toxicity to be used in dwellings. From kitchens and pantries, poison traces are ingested by humans due to contaminated cooking utensils, dishes, silverware and foodstuffs.