What are the harmful effects of insects, pest, vermin and rodents to public health?

What are the harmful effects of insects, pest, vermin and rodents to public health?What are the harmful effects of insects, pest, vermin and rodents to public health?
They spread disease, for example cockroaches walk in the sink drains and toilets and then all over your dishes and foods spreading germs not normally present on those items, rats and mice can carry diseases and also chew wiring in homes and cause fires, they also carry fleas, and bees, scorpions and wasps can sting. If there is a build up of cockroache-poo that can cause asthma and allergies in people who are living in those conditions, especially children.