Which flea is the most common pest flea worldwide?

• A. Dog fleas
• B. Cat fleas
• C. Human fleas
• D. Rat fleas

Answer: (B)

Cat fleas are the most common flea pest worldwide because they bite and persist on a wide range of hosts—especially cats and dogs—but also readily infest other mammals and even people when pets are nearby. Their life cycle thrives in indoor environments people share with pets: eggs fall off the host into carpets, bedding, and cracks; larvae feed on organic debris in the environment; and pupae can persist until a host is present. This combination of broad host range and strong establishment in homes leads to widespread, year‑round populations. Other fleas are more tightly tied to specific hosts or conditions, so they’re less common globally.