A multistate listeriosis outbreak associated with cantaloupe consumption was reported in the United States in September, 2011. The outbreak investigation recorded a total of 146 invasive illnesses, 30 deaths and one miscarriage. Subtyping of the outbreak associated clinical, food and environmental isolates revealed two serotypes (1/2a and 1/2b) and four… (More)
Listeria monocytogenes, a foodborne bacterial pathogen, causes invasive and febrile gastroenteritis forms of listeriosis in humans. Both invasive and febrile gastroenteritis listeriosis is caused mostly by serotypes 1/2a, 1/2b and 4b strains. The outbreak strains of serotype 1/2a and 4b could be further classified into several epidemic clones but the… (More)
Listeria monocytogenes strains that show a novel PCR serotyping profile (IVb-v1) have been reported recently. Here, we announce the draft genome sequences of five L. monocytogenes IVb-v1 strains isolated from the United States and Australia that harbor a 6.3-kb DNA cassette characteristic of serotype 1/2a strains.
Four Listeria isolates, including an atypical strain, were isolated from various pet foods and sequenced. We report here the draft genome sequences of these isolates and a comparative genomic analysis with a closely related human clinical isolate. An analysis of the atypical strain identified a frameshift mutation in the prfA gene.
Over 90% of the human listeriosis cases are caused by Listeria monocytogenes serotypes 1/2a, 1/2b and 4b strains. As an alternative to antigen-antibody based serotyping, a PCR-based method for serogrouping has been developed and validated. In this communication, we report an in-depth analysis of five 4b variant strains, four clinical isolates from Australia… (More)