ABSTRACT
Resumen El objetivo de este estudio fue evaluar la capacidad inhibitoria de Lactiplantibacillus plantarum LP5 frente a Campylobacter coli en ensayos de formación de biopelículas in vitro y exclusión competitiva. La formación de biopelículas por C. coli NCTC11366, C. coli DSPV458, C. coli DSPV541 y C. coli DSPV570 fue evaluada mediante medición de DO. La capacidad inhibitoria de L. plantarum LP5 frente a C. coli fue evaluada sobre discos de vidrio, nailon y aluminio. Sobre una biopelícula de L. plantarum se adicionó C. coli para cuantificar el efecto inhibidor de L. plantarum LP5 sobre el patógeno. Las cuatro cepas de C. coli fueron clasificadas como moderadas formadoras de biopelículas. El ensayo de exclusión competitiva mostró que la formación de biopelículas de las cepas de C. coli en todos los materiales fue significativamente mayor que la formación de biopelículas de cada patógeno en presencia de biopelículas de L. plantarum LP5. Si bien es necesario realizar más pruebas para confirmar la capacidad de supervivencia de C. coli en ambientes hostiles hasta llegar al huésped, este estudio permitiría avanzar en el esclarecimiento de su comportamiento mediante la formación de biopelículas.
Abstract The objective of this study was to evaluate the inhibitory capacity of Lactiplantibacillus plantarum LP5 against Campylobacter coli in in vitro biofilm formation and competitive exclusion assays. Biofilm formation by C. coli NCTC11366, C. coli DSPV458, C. coli DSPV541 and C. coli DSPV570 was evaluated by OD measurement. The inhibitory capacity of L. plantarum LP5 against C. coli was evaluated on glass, nylon and aluminium discs, added with L. plantarum and incubated at 37°C for 72 h. C. coli was added to each washed well. The plates were incubated at 42°C for 72 h in microaerophilic conditions and the biofilms were detached for quantification. The four strains of C. coli were classified as moderate biofilm former. The competitive exclusion test showed that the biofilm formation of the C. coli strains in all materials was significantly higher than the biofilm formation of each pathogen in the presence of L. plantarum LP5 biofilms. Although it is necessary to carry out more tests to confirm the ability of C. coli to survive in hostile environments until reaching the host, this study would allow progress in the elucidation of its behaviour through the formation of biofilms.
ABSTRACT
In veterinary practice, the risk of zoonotic infections starts in College, when students are exposed to animals, and laboratory assignments. The objective of this study was to estimate awareness of zoonoses in a cohort of freshmen at the Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral, Santa Fe (Argentina). A cross sectional study was conducted using a structured questionnaire in all students attending an introductory course (N= 179) on April, 2012. Data analysis included descriptive statistics and χ2. Zoonoses most frequently mentioned by students were rabies, scabies, tuberculosis and leptospirosis. Rural residence was associated with the recognition of ringworm (P= 0.0136), tuberculosis (P= 0.0302), leptospirosis (P= 0.0205) and hydatidosis (P= 0.0167) as zoonoses. Males showed higher awareness of trichinosis (P= 0.0025), tuberculosis (P= 0.0286), anthrax (P= 0.0035), and brucellosis (P= 0.0038) than females. Awareness of susceptible species and means of transmission varied among all zoonoses. These results reinforce the need for early exposure of veterinary students to occupational health and biosafety practices.
No exercício da medicina veterinária, o risco de contrair zoonoses está presente desde o período estudantil, proporcionado pela exposição a animais e também a atividades laboratoriais. O objetivo deste estudo foi estimar o conhecimento sobre zoonoses em um grupo de estudantes recém-matriculados no curso de medicina veterinária da Universidade Nacional do Litoral, Santa Fe (Argentina). Realizou-se um estudo transversal utilizando-se um questionário pré-elaborado para todos os alunos recémmatriculados (N=179). A análise dos dados incluiu estatísticas descritivas e teste Qui-quadrado (X2 ). As zoonoses mais citadas pelos alunos foram raiva, sarna, tuberculose e leptospirose. A variável "residir em áreas rurais" esteve associada ao reconhecimento de dermatofitoses (P=0,0136), tuberculose (P=0,03020), leptospirose (P=0,0205) e hidatidose (P=0,0167), como zoonoses. Da mesma forma, a variável "sexo masculino" esteve associada à identificação de triquinelose (P=0,0025), tuberculose (P=0,0286), carbúnculo hemático (P=0,0035) e brucelose (P=0,0038). O conhecimento sobre as formas de transmissão e as espécies acometidas variou de acordo com cada zoonose em particular. Esses resultados reforçam a necessidade de um contato mais precoce de estudantes de medicina veterinária com temas relacionados com a saúde ocupacional e práticas de biossegurança. Palavras chave: higiene, estudantes de veterinária, segurança do trabalho, infecções zoonóticas.