The authors thank Arjen A. Wagendorp for the genetic
characterization of the isolates and Klaas Le¤ring for the
carefully carried out UHT experiments.
Part of the research work presented here was supported
by Tetra Pak Research, Stuttgart, Germany (Dr
Fritz Lembke). We thank Stork CRO, Nieuw Vennep,
The Netherlands, for kindly providing equipment for the
tube heating method