Bartonella is a genus of bacteria that can infect humans and animals. These bacteria are often transmitted through bites from infected insects, such as fleas and ticks. Some common species include Bartonella henselae, which causes cat scratch fever, and Bartonella bacilliformis, associated with Carrion's disease. Infections caused by Bartonella can lead to various symptoms, including fever, fatigue, and swollen lymph nodes. Diagnosis typically involves blood tests, and treatment usually consists of antibiotics. Awareness of Bartonella is important for preventing and managing these infections, especially in areas where the bacteria are prevalent.