Abstract
In this study, we investigated the anomalous blue discoloration in fresh cheeses produced in Brazil (Minas Frescal). Isolates (n = 31) obtained from Minas Frescal cheeses with blue discoloration and identified as Pseudomonas spp. through PCR. These isolates were characterised as able to produce a diffusible blue pigment in vitro at different temperatures (5, 14 and 25 °C) after 24 h of incubation. Two isolates (A006 and B157) were selected and subjected to whole-genome sequencing; an in silico multi-locus sequence typing identified one new allelic profile for B157 and showed that isolates that produce the blue discoloration possibly share a common evolutionary development. Furthermore, algorithms ANIb, GGDC and inferred tree from GBDP distances, allowed the identification of B157 as Pseudomonas carnis and A006 as a potential novel species. For the first time, Pseudomonas strains that cause blue discoloration in Minas frescal cheese in Brazil were investigated and identified.
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