الملخص

Occurrenee of Brucella was manitored in 100 samples of blood, 5 samples of cerebrospinal fluid and 1 sample of synoviai fluid from same patiints suffering from sings of undulant fever in same districts of Baghdad and these cases of undulant fever were studied and all of them were suffering frorn the diagnostic sings of the disease beside the presence of dangerous sings of neurobrucellosis .The incidence of disease present in both sexes and the percentage was higher in female than male 60 % ,40yo respectively and the highest incidence of disease occulred in the range of ( 6-48 ) year .The rose bengal test and the indirect Fluorescent antibody test were done on patients serum and positive results appeared as 100 o/o and70.2% respectively Bacterial isolation by Castaneda bi - Phasic medium revealed 23 bactedal isolates , i 8 isolates ,4 isolates , 1 isolate from blood , cerebrospinal fluid , synovial fluid respectively .The biotypes were determined as showed that 8 isolates were of B. aborlus biotype 3rd.,4th. and 15 isolates of B. melitensis of the second and third biotypes. The sensitivity test tbr the isolates were done by using different antibiotics .