Abstract
Spontaneously occurring bacteriophage-resistant mutants of Actinomyces viscosus were isolated. The mutants exhibited altered coaggregation patterns with streptococci. From analysis of the data, it appears that a cell surface structure on A. viscosus may function both as a phage receptor and as a binding site for co-aggregation with certain oral streptococci. These mutants will be valuable in the study of surface structures that mediate one type of the cell-to-cell interactions that occur between these two important groups of oral bacteria.
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