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Of the 13 serotypes, 4b serotype strains are responsible for the majority of recorded invasive listeriosis outbreaks, although some recent listeriosis outbreaks have been attributed to strains of serotypes 1/2a and 1/2b. Virulence and response to osmotic stress in 41 Listeria monocytogenes strains representing serotypes 1/2a, 1/2b and 4b was investigated. It was found that serotype 4b and 1/2b strains...
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