4. Fleas
If you have pets, you may have experienced having to deal with these at one point, but fleas are more destructive than making your corgi scratch. Historically, they were the primary vectors responsible for the spread of the bubonic plague. By feeding on the blood of infected rats and biting humans, they helped rapidly spread of the disease.
They are considered dangerous as they spread disease between many different species. They feed on all warm blooded vertebrates including dogs, cats, chickens, rabbits, humans, rats and mice. Females can lay more than 5,000 eggs during their life and they often mature between 30 to 90 days. This rapid growth rate makes them ideal candidates for the spread of bacteria, viruses, protozoa etc. Their flat bodies also allow them easily move and hide themselves on the host body or hair.
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