Duplicate phage typing tests of 150 isolates of methicillin-sensitive and -resistant Staphylococcus aureus at 100 times the routine test dilution showed that the existing reaction difference rule remains satisfactory when isolates are tested on the same day; i.e., two or more reactions must differ before isolates should be considered distinct. However, if typing is done on different days, a three-reaction-difference rule is needed.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC120138 | PMC |
| http://dx.doi.org/10.1128/JCM.40.1.292-293.2002 | DOI Listing |
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