In the study, only one strain (B-59801) carries neither stx2 nor
eae genes, and does not belong to the big six serovars. This strain
has a medium HPP resistance and could be safer to use as a surrogate
for laboratory safety purposes. In addition, B-59801 also hadmoderate radiation resistance as noted by Sommers et al. (2015),
therefore B-59801 may be used as a surrogate in both HPP and
irradiation studies.