Dr. Edward Breitschwerdt, professor of internal medicine at NC State's College of Veterinary Medicine, and NC State colleague Dr. Ricardo Maggi found the bacterium Bartonella melophagi from samples of human blood. B. melophagi is considered a "Candidatus" species of the genus Bartonella. Sheep are main host for B. melophagi, transmission by wingless fly known as a ked and transmission to humans is unknown. The blood samples from healthy women, her symptoms is muscle fatigue and weakness and one of the patients had inflammation of the membrane of heart. Bartonella henselae, a strain of the bacterium, it's causes human illness(neurological illnesses and fatigue). Several decades have increased the number of Bartonella species quickly and a small number of Bartonella. This is a discovery more about Bartonella bacteria ,that cause human infection.