Genus Brucella
BrucellaGram-negative , coccobacilli ,arranged singly , pairs or short chains . Non-motile. Non- Capsulated
Culture characteristics: All strains grow best in a medium enrich with animal serum , liver extract and glucose: serum dextrose agar Liver broth Liver agar Trypticase soy agar
Castaneda biphasic medium (broth & agar) the selective media for genus brucella. The growth of brucella is slow.
Castaneda biphasic medium
Agglutination TestA-Slid Method(Rose Bengal card test) 1-Screening Method 2- Titration Method B-Standard Tube Agglutination Test
Some activity of Brucella species
Dye sensitivityH2S Production
Co2 Requirement
Species
Thinon
Carbol Fuchsin
sensitive
resistant
+
+
Br. abortus
resistant
resistant
-
-
Br. melitensis
resistant
sensitive
+
-
Br. suis