Abstract
Corynebacterium striatum strains have been increasingly reported as etiological agents of nosocomial infections and outbreaks in industrialized and developing countries. However, there are few studies focused on the virulence potential of C. striatum. A growing body of research supports the use of Caenorhabditis elegans as a model host for investigating the virulence potential of pathogenic bacteria, including corynebacteria. In the present study, chemotaxis behaviour, mortality, and morphological changes were investigated in nematodes infected by four C. striatum strains isolated from different clinical sites, and with different MDR profiles and PFGE types. The results showed chemotaxis of nematodes towards C. striatum. Nematode death (> 60%) was detected from the first day post-infection with all strains tested, but at different levels, independent of biofilm formation on catheter surfaces and differences in growth temperature between nematodes (20 °C) and mammals (37 °C). C. striatum 2369/II multidrug-resistant (MDR; from tracheal aspirate of a patient undergoing endotracheal intubation) and 1961/III multidrug-sensitive (MDS; urine) strains led to 100% mortality in worms. Survival of nematodes was observed until 4 days post-infection with the C. striatum 1954/IV MDS strain isolated from a surgical wound (13%) and 1987/I MDR strain isolated from a patient with a lower respiratory tract infection (39%). The Dar phenotype was observed post-infection with all MDS and MDR strains except 1954/IV. All strains showed the capacity for bagging formation. Star formation was observed only with strains that led to 100% nematode mortality. In conclusion, C. striatum was found to exert virulence for C. elegans. Variations in nematode morphological changes and levels of mortality indicate differences in the virulence potential of C. striatum independent of clinical isolation site, capacity for biofilm formation, and MDR and PFGE profiles.
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In memory: Doctor Raphael Hirata Júnior
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Sub-Reitoria de Pós-graduação e Pesquisa da Universidade do Estado do Rio de Janeiro (SR-2/UERJ).
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Study conception or design: CS, LSL, ALMG. General orientation of the study: ALMG. Conductance of research: CS, LSL, HFM, YFV, FCO, SCS, MEFCC, AESC. Data analysis: CS, LOM, ALMG. Contribution of new methods or models: MGL, CSS. Writing of the paper: CS, LSL, ALMG.
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This study was approved by the Research Ethics Committee of the Hospital University Pedro Hernesto of Rio de Janeiro City (no. CEUA CONCEA-029/2015).
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Souza, C., Simpson-Louredo, L., Mota, H.F. et al. Virulence potential of Corynebacterium striatum towards Caenorhabditis elegans. Antonie van Leeuwenhoek 112, 1331–1340 (2019). https://doi.org/10.1007/s10482-019-01265-9
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DOI: https://doi.org/10.1007/s10482-019-01265-9