title: Reaction difference rule for phage typing of Staphylococcus aureus at 100 times the routine test dilution.
abstract: 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.
authors.affiliation: LHI, CPHL, London NW9 5HT, United Kingdom. tpitt@phls.org.uk
authors.forename: Hazel M
authors.initials: HM
authors.lastname: Aucken
authors.forename: Kate
authors.initials: K
authors.lastname: Westwell
mesh_terms: D001434:Bacteriophage Typing / Q000379:methods* / Q000592:standards*; D006801:Humans; D008712:Methicillin / Q000494:pharmacology; D016106:Methicillin Resistance; D010406:Penicillins / Q000494:pharmacology; D015203:Reproducibility of Results; D013203:Staphylococcal Infections / Q000382:microbiology; D013211:Staphylococcus aureus / Q000145:classification* / Q000187:drug effects / Q000821:virology
chemical_list: D010406:Penicillins; D008712:Methicillin