The characteristics of a variant strain of Brucella melitensis Rev 1.
Circumstantial evidence is presented for the occurrence of a variant of a vaccine strain of B. melitensis Rev 1, designated "FSA" (foreign South African). FSA resembles Rev 1 in its reactions to penicillin and streptomycin but reacts closer to a field strain of B. melitensis as regards dye (thionine and basic fuchsin) sensitivity and colony size. Although colonies of Rev 1 were consistently smaller than other B. melitensis strains, their size was 0,75 mm as opposed to the 1-2 mm reported in the literature, while B. melitensis 16M colonies were 1,25-1,5 mm as opposed to the 3-4 mm previously reported. Rev 1 was found to be urease positive, unless a test of low sensitivity was applied.
Pieterson
P M
PM
Veterinary Research Institute, Onderstepoort.
Gummow
B
B
Pefanis
S
S
Venter
C G
CG
Herr
S
S
D002002:Brucella / Q000145:classification* / Q000302:isolation & purification; D013019:South Africa