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Arbitrarily primed–polymerase chain reaction (PCR) results: an example of 1 triad with mutans streptococci (MS) transmission, using OPA-5 primer. Lanes 1 to 10 show isolates from the child, lanes 11 to 20 are isolates from the mother, and lanes 21 to 30 are isolates from the grandmother. (*) indicates a shared genotype between the grandmother and the child (transmission). (◊) indicates another uniquely shared genotype between the grandmother, the mother, and the child.
