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Santos LS, Rossi DA, Braz RF, Fonseca BB, Guidotti–Takeuchi M, Alves RN, Beletti ME, Almeida-Souza HO, Maia LP, Santos PDS, de Souza JB, de Melo RT. Roles of viable but non-culturable state in the survival of Campylobacter jejuni. Front Cell Infect Microbiol 2023; 13:1122450. [PMID: 37056707 PMCID: PMC10086134 DOI: 10.3389/fcimb.2023.1122450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 03/09/2023] [Indexed: 03/30/2023] Open
Abstract
Despite being considered fragile and fastidious, Campylobacter jejuni is the most prevalent cause of foodborne bacterial gastroenteritis, and chicken meat is considered the main vehicle of transmission to humans. This agent can survive adverse conditions in the form of biofilms, but extreme stress (nutritional, oxidative and thermal) promotes the acquisition of a state called viable but not culturable (VBNC). The emergence of this pathogen worldwide and the recent international requirements in its control instigated us to qualitatively and quantitatively estimate the time required for the acquisition of the VBNC form in 27 strains of C. jejuni, characterize morphological aspects, determine its adaptive and invasive potential and perform comparative metabolomic evaluation. Extreme stress promoted the complete acquisition of the VBNC form in a mean time of 26 days. Starting from an average initial count of 7.8 log CFU/mL, the first four days determined the greatest average reduction of the culturable form of 3.2 log CFU/mL. The scanning and transmission image analyses showed a transition from the typical viable form (VT) to the VBNC form, with initial acquisition of the straight rod shape, followed by loss of the flagella and subdivision into two to 11 imperfect cocci arranged in a chain and rich in cellular content, until their individual release. RT-PCR identified the presence of ciaB and p19 transcripts in the 27 cultivable C. jejuni strains, a character maintained in the VBNC form only for p19 and in 59.3% (16/27) of the VBNC strains for the ciaB gene. The average inoculation of 1.8 log CFU/mL of C. jejuni VBNC into primary chicken embryo hepatocyte cells promoted the occurrence of apoptosis processes significantly after 24 hours of contact by one of the strains tested. In C. jejuni VBNC, we detected higher expression of metabolites linked to protective and adaptation mechanisms and of volatile organic precursor compounds indicative of metabolism interruption. The oscillations in the time of acquisition of the VBNC form together with the presence of transcripts for ciaB and p19, the identification of cell lysis and metabolites that ensure the maintenance of the pathogen alert to the fact that C. jejuni VBNC remains virulent and adapted to stress, which makes evident the potential danger of this latent form, which is not detectable by official methodologies.
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Affiliation(s)
- Leticia Silva Santos
- Laboratory of Molecular Epidemiology, Federal University of Uberlandia, Uberlandia, Brazil
| | - Daise Aparecida Rossi
- Laboratory of Molecular Epidemiology, Federal University of Uberlandia, Uberlandia, Brazil
| | | | | | | | | | | | | | - Larissa Prado Maia
- Biotechnology Institute, Federal University of Uberlandia, Uberlandia, Brazil
| | | | | | - Roberta Torres de Melo
- Laboratory of Molecular Epidemiology, Federal University of Uberlandia, Uberlandia, Brazil
- *Correspondence: Roberta Torres de Melo,
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Bacterial community identification in poultry carcasses using high-throughput next generation sequencing. Int J Food Microbiol 2022; 364:109533. [DOI: 10.1016/j.ijfoodmicro.2022.109533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 01/03/2022] [Accepted: 01/04/2022] [Indexed: 11/24/2022]
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Perdoncini G, Sierra Arguello YM, Moreira Lima L, Quedi Furian T, Apellanis Borges K, Beatriz Rodrigues L, Ruschel Dos Santos L, Borsoi A, Werlang Isolan L, Gomes MJP, Pippi Salle CT, de Souza Moraes HL, Pinheiro do Nascimento V. Detection and Quantification of Campylobacter in Poultry Slaughterhouses Using Conventional Microbiological Technique, Most Probable Number, and Real-Time PCR. Foodborne Pathog Dis 2021; 19:143-150. [PMID: 34898274 DOI: 10.1089/fpd.2021.0071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Campylobacteriosis is one of the most common bacteria causing human gastroenteritis. Poultry is a major reservoir of Campylobacter spp. as well as the main source of transmission. Due to the increased occurrence of campylobacteriosis, poultry slaughterhouses are under pressure to deliver carcasses with low contamination. However, a few studies have been carried out to evaluate Campylobacter contamination of broiler carcasses in Brazilian slaughter lines. Therefore, in this study, we aimed at detecting and quantifying the thermotolerant Campylobacter spp. at different stages of the poultry slaughtering process. The samples were collected from 12 points in three slaughterhouses in southern Brazil, at an interval of 12 months, and were tested for Campylobacter spp. by conventional microbiological technique, the most probable number, and real-time PCR. A total of 432 samples were analyzed. The majority of strains belonged to Campylobacter jejuni (92%), and the flock positivity among the three techniques was similar in most cases. Campylobacter was detected in all slaughtering stages. Although contamination has remained similar (p > 0.05) throughout almost all the slaughter process, evisceration seemed to be an important source of contamination. Our results reinforce the idea that the final carcass quality after the slaughtering process is directly influenced by the level of contamination of the broiler flocks on arrival at the processing plant.
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Affiliation(s)
- Gustavo Perdoncini
- Departamento de Medicina Animal, Centro de Diagnóstico e Pesquisa em Patologia Aviária, Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Yuli Melisa Sierra Arguello
- Departamento de Medicina Animal, Centro de Diagnóstico e Pesquisa em Patologia Aviária, Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Leonardo Moreira Lima
- Departamento de Medicina Animal, Centro de Diagnóstico e Pesquisa em Patologia Aviária, Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Thales Quedi Furian
- Departamento de Medicina Animal, Centro de Diagnóstico e Pesquisa em Patologia Aviária, Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Karen Apellanis Borges
- Departamento de Medicina Animal, Centro de Diagnóstico e Pesquisa em Patologia Aviária, Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Laura Beatriz Rodrigues
- Faculdade de Agronomia e Medicina Veterinária, Universidade de Passo Fundo, Passo Fundo, Brazil
| | | | - Anderlise Borsoi
- Faculdade de Medicina Veterinária, Universidade Tuiuti do Paraná, Curitiba, Brazil
| | - Leonardo Werlang Isolan
- Departamento de Medicina Animal, Centro de Diagnóstico e Pesquisa em Patologia Aviária, Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Departamento de Inspeção de Produtos de Origem Animal, Ministério da Agricultura, Pecuária e Abastecimento, Porto Alegre, Brazil
| | - Marcos José Pereira Gomes
- Departamento de Medicina Veterinária Preventiva, Laboratório de Bacteriologia, Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Carlos Tadeu Pippi Salle
- Departamento de Medicina Animal, Centro de Diagnóstico e Pesquisa em Patologia Aviária, Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Hamilton Luiz de Souza Moraes
- Departamento de Medicina Animal, Centro de Diagnóstico e Pesquisa em Patologia Aviária, Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Vladimir Pinheiro do Nascimento
- Departamento de Medicina Animal, Centro de Diagnóstico e Pesquisa em Patologia Aviária, Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
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