However, ST 398 is an identification using a particular technique called MLST (multi-locus sequence typing), which is used for this strain because the standard typing method, PFGE (pulsed-field gel electrophoresis), did not return a readable result when the strain was first identfied back in 2004. (Trivia: he is why the initial reports of this strain called it NT, for nontypeable.) it is becomin