Type 1 products are subjected to an in-pack-pasteurization for at
least 10 min at 90 C or equivalent (P90 10 min) (Fig. 2). This heat
treatment is generally recognized as safe harbor and will eliminate
vegetative cells of L. monocytogenes, B. cereus and C. botulinum.
Heat-resistant spores of B. cereus, C. botulinum and other spore
forming microorganisms can survive this treatment. Peck,
Goodburn, Betts, and Stringer (2008) described several “unquantified
controlling factors” (e.g. damage by heat processing) which
are likely to have an effect on the growth and toxin production by
psychrotrophic non-proteolytic C. botulinum and which may
explain why commercial short shelf life chilled foods have not been
implicated in foodborne botulism outbreaks.