Application of MALDI-TOF mass spectrometry and specific PCR for tracking of E. coli O157:H− strain 431/97 in Batavia lettuce

Chemical and Biological Technologies in Agriculture

Table 1 Results of the MALDI biotyping of selected putative E. coli O157:H⁻ isolates of Batavia lettuce rhizo- and phyllosphere

Isolate number	Source	Inoculation level/sampling day^a	Score value
48	R	H/1	2.504
181 4	R	H/7	2.514
249 b1	R	H/14	2.561
249 b2	R	H/14	2.531
282 1	P	H/1	2.436
282 2	P	H/1	2.408
283	P	H/1	2.431
284	P	H/1	2.418
285	P	H/1	2.389
289	P	H/1	2.234
291 a	P	H/1	2.399
291 1a	P	H/1	2.340
292	P	H/1	2.366
294 1	P	H/1	2.226
295 b2	P	H/1	2.317
296	P	H/7	2.426