Bartonella henselae is a cat scratch disease's etiological agent which is usually manifestated as regional lymphadenopathy. In differential diagnosis of lymphadenopathy infections about etiology B. henselae are rarely taken into consideration. Enlargement of lymph nodes observed in children more often than in adults are caused by bacterial, virus or parasitic factors. In this study immunoglobulines G class antibodies to B. henselae were determined among children with limphadenopathy. At 53 children with recognized lymphadenopathy IgG antibodies were determined by indirect immunofluoroscence method specific for B. henselae. Of the 53 subjects examined, positive results were got at 29 (55%) children. Of the 23 children with negative results of IgG antibodies in 9 children study was repeated. In 5 (56%) cases the increase of IgG antibodies were shown with relation to the first research. The cat scratch disease should be considered as a cause of lymphadenopathy at children because the frequency of occurance of antibodies IgG specific for B. henselae is high. In case of getting negative results, participation of B. henselae should not be out of question in limphadenopathy etiology at children and second determination should be repeted after 10-21 days since the first one.