Photo credit: Denni ScnappFleaScienceSummary Cat fleas can survive and reproduce on a diet of human blood alone. However, in normal settings they don’t live or breed on humans. Females must feed freely for many hours to be able reproduce on humans. This doesn’t happen outside of laboratories.Survival Cat fleas can survive solely on a diet of human blood. They’re capable of living for 139 to 185 days if fed on human arms for 15 minutes each day.2 10 minute feeding intervals can keep females alive for up to 30 days, and males for 17 days.1 In a recent study,...