Dl. Baggesen et al., SEPARATION OF SALMONELLA-TYPHIMURIUM DT2 AND DT135 - MOLECULAR CHARACTERIZATION OF ISOLATES OF AVIAN ORIGIN, European journal of epidemiology, 13(3), 1997, pp. 347-352
In Denmark, 0.4 and 3.4% of the human Salmonella Typhimurium cases reg
istered between 1988 and 1993 were caused by DT2 and DT135, respective
ly. Separation of these two phage types was, however, problematic as o
nly minor differences in lysis pattern and lysis strength occurred. Mo
lecular characterization of 23 Danish isolates, 10 German isolates and
the two type strains have subsequently been performed. With only mino
r exceptions, strains examined could be separated by combination of 0:
5 agglutination, ribotyping, and PFGE typing into two major groups in
conformity with their phage types. The differences between the two gro
ups were, however, very small and it has not been completely clarified
whether this grouping is the result of two independent types or of tw
o related lines developing in different environments. It is concluded
that the classification of related phage types DT2 and DT135 has to be
supported by molecular methods.