Abstract
In this study, selected haemagglutination-positive and haemagglutination-negative streptococci of serological group B were investigated in HeLa-cell- and alveolar-macrophage adherence tests. The cultures, isolated from bovine milk samples, had been previously serotyped and further characterized. All haemagglutination-positive group B streptococci adhered in high numbers to HeLa cells and alveolar-macrophages of rabbits. Haemagglutination-negative group B streptococci showed no comparable adherence. The adherence to alveolar-macrophages of rabbits was further characterized. This adherence appeared to be time- and temperature-dependent and could be inhibited by heat or proteolytic treatment of the bacteria. After opsonization of the bacteria, an adherence to alveolar-macrophages could also be observed for haemagglutination-negative group B streptococci, indicating a separate adherence mechanism. The group B streptococcal adherence might represent an important prerequisite for invasion and possibly intracellular survival of this bacterial species.
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