August 8, 2025

serotype 4b strains demonstrate a fitness advantage over strains of serotypes 1/2a and 4b-v1 on cantaloupe rind and flesh at different temperatures.

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Serotype 4b displays a fitness advantage over serotypes 1/2a and 4b-v1 on cantaloupe, suggesting its role in foodborne outbreaks.

Serotype 4b exhibited significantly better fitness on cantaloupe rind compared to serotype 1/2a.
Approximately 50% of colonies recovered from rind were serotype 4b, indicating its prevalence.
Incubation temperature did not affect the growth of L. monocytogenes on cantaloupe surfaces.
Strains of sequence type 382 (4b-v1) did not show a fitness advantage on cantaloupe despite being overrepresented in environmental isolates.

Gorski et al. (2025) studied this question.

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