Eight strains of Legionella pneumophila were used to optimize cleavage of DNA with BssHII, SalI, or SpeI and separation by pulsed-field electrophoresis. Isolates from a community outbreak involving a contaminated hot tub were genomically identical. Cleavage patterns were distinctly different for unrelated environmental and nosocomial strains from a single hospital.
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Johnson et al. (1994) studied this question.
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