Species Designation Origin Lactobacillus acidophilus LA-11, DGCC 9353, IMT 22354 Danisco, Kantvik, Finland Lactobacillus acidophilus IMT 30260 Proviact® yoghurt Lactobacillus reuteri K1 D287 Botazzi v. 2/91, IMT 21493 Institute of Meat Hygiene and Technology, Freie Universität Berlin, Germany Sample isolates     Lactobacillus acidophilus IMT 32362 dm Milchsäure-Kulturen Bifido-Flor capsules Lactobacillus reuteri DSM 17938, IMT 32017 Reuflor® chewable tablets

Abbreviations IMT: Institut für Mikrobiologie & Tierseuchen strain collection number DSM: Deutsche Sammlung von Mikroorganismen strain collection number

Table 1: Reference Lactobacillus strains and field isolates obtained from tablets in this study.