Adult fleas are biting insects that feed on warm-blooded animals. Worldwide, approximately 2,500 species of fleas have been identified, seven of which can affect human health. The cat flea is the most commonly observed pest species, and infests cats and dogs, occasionally biting humans and other animals. Most problems with cat fleas arise from bites, allergies and annoyance. Although fleas were less common in recent years due to effective management techniques, overuse and resistance to pesticides could increase the pest status of this insect in the future.