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Fleas are probably the most common ectoparasite (external parasite) of dogs and cats worldwide. In addition to just being a nuisance, fleas are responsible for flea allergy dermatitis (FAD) in dogs and cats, which is estimated to account for over 50 percent of all the dermatological cases reported to veterinarians.
Fleas can carry and trasmit several potential serious illnesses to humans, including typhus and plague, and can transmit "cat scratch disease" (infection with Bartonella) among cats who can then spread the disease to humans. Additionally, fleas serve as an intermediate host for tapeworms, which can infect your pet and also humans.
Ticks are also extoparasites. Ticks are important vectors of a number of diseases, including Lyme disease, Rocky Maountain spotted fever, relapsing fever, chrlichiosis, tularemia and tick paralysis. Ticks are second only to mosquitos as vectors of human disease, both infectious and toxic. Control and prevention of ticks is extremely important in reducing the risk of disease associated with ticks.
Speak to your veterinarian for recommendations on the best flea and tick control for your pets.