Closed Genome Sequences of Providencia alcalifaciens Isolates from Dogs

Haverkamp, Thomas; Kaspersen, Håkon; Øines, Øivind; Spilsberg, Bjørn; Telke, Amar A.; Lagesen, Karin; Slettemeås, Jannice Schau; Mo, Solveig Sølverød; Jørgensen, Hannah Joan; Sekse, Camilla

doi:10.1128/mra.00955-21

Cited by 1 publication

(1 citation statement)

References 14 publications

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“…Preparation of the spiking strain and DNA extraction from DFCs in the sensitivity assay and field control An in-house P. alcalifaciens strain (2019-04-27799-1-2) (Jørgensen et al, 2021;Haverkamp et al, 2022) was used to spike samples in the sensitivity assay, and the dilutions of this P. alcalifaciens strain were prepared the following way: cultivation overnight at room temperature under aerobic conditions in brain heart infusion (BHI) media (cat. no.…”

Section: Cultivation Of Faecal Swabsmentioning

confidence: 99%

Defining a metagenomic threshold for detecting low abundances of Providencia alcalifaciens in canine faecal samples

Aardal,

Soltvedt,

Nørstebø

et al. 2024

Front. Cell. Infect. Microbiol.

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IntroductionAcute haemorrhagic diarrhoea syndrome (AHDS) in dogs is a condition of unknown aetiology. Providencia alcalifaciens is suspected to play a role in the disease as it was commonly found in dogs suffering from AHDS during a Norwegian outbreak in 2019. The role of this bacterium as a constituent of the canine gut microbiota is unknown, hence this study set out to investigate its occurrence in healthy dogs using metagenomics.Materials and methodsTo decrease the likelihood of false detection, we established a metagenomic threshold for P. alcalifaciens by spiking culture-negative stool samples with a range of bacterial dilutions and analysing these by qPCR and shotgun metagenomics. The detection limit for P. alcalifaciens was determined and used to establish a metagenomic threshold. The threshold was validated on naturally contaminated faecal samples with known cultivation status for P. alcalifaciens. Finally, the metagenomic threshold was used to determine the occurrence of P. alcalifaciens in shotgun metagenomic datasets from canine faecal samples (n=362) collected in the HUNT One Health project.ResultsThe metagenomic assay and qPCR had a detection limit of 1.1x103 CFU P. alcalifaciens per faecal sample, which corresponded to a Cq value of 31.4 and 569 unique k-mer counts by shotgun metagenomics. Applying this metagenomic threshold to 362 faecal metagenomic datasets from healthy dogs, P. alcalifaciens was found in only 1.1% (95% CI [0.0, 6.8]) of the samples, and then in low relative abundances (median: 0.04%; range: 0.00 to 0.81%). The sensitivity of the qPCR and shotgun metagenomics assay was low, as only 40% of culture-positive samples were also positive by qPCR and metagenomics.DiscussionUsing our detection limit, the occurrence of P. alcalifaciens in faecal samples from healthy dogs was low. Given the low sensitivity of the metagenomic assay, these results do not rule out a significantly higher occurrence of this bacterium at a lower abundance.

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Section: Cultivation Of Faecal Swabsmentioning

confidence: 99%