Abstract The increased worldwide demand for chicken meat requires constant automation of operating systems and the proper implementation of self-control programs by slaughterhouses. Thus, this study aimed to evaluate the efficacy of a self-washing system using heated water on reducing the load of public health concern bacteria on a broiler feet-cutter disc. In a three-month period, 84 samples (n = 42 per group) were collected for microbiological analysis from the feet-cutter disc with an operational self-washing process with Non-Heated Water (NHW) and Heated Water (HW). The logarithmic counts of Mesophilic Aerobics, Sulphite-Reducing Clostridia (SRC), Escherichia coli and Staphylococcus aureus in the NHW group were 1.82, 0.56, 0.31 and 0.14 Log10 CFU/cm2, respectively, whereas in the HW group were 1.17, 0.04, 0.15 and 0.08 Log10 CFU/cm2. Salmonella spp. was absent in all evaluated samples in both groups. The heated-water system reduced bacterial count, but statistical differences were solely observed for Mesophilic Aerobics and SRC. Nevertheless, its usage could be an additive in the operational procedure to avoid microbiological violations of food safety, in addition to being easy-to-implement and affordable for the industry.

Resumo O aumento mundial da demanda por carne de frango exige constante automação de sistemas de operação e implementação adequada de programas de autocontrole pelos abatedouros. Assim, o objetivo do presente estudo foi avaliar a eficiência de sistema de autolavagem com água aquecida na redução da contagem de bactérias de interesse em saúde pública em disco corta-pés de frangos. Em um período de três meses, 84 amostras (n = 42, por grupo) foram colhidas para análises microbiológicas em disco corta-pés contando com um sistema operacional de autolavagem com água não aquecida (NHW) e água aquecida (HW). As contagens de Aeróbios Mesófilos, Clostridium Sulfito-redutor, Escherichia coli e Staphylococcus aureus, no grupo NHW, foram de 1,82, 0,56, 0,31 e 0,14 Log10 UFC/cm2, respectivamente, enquanto que, no grupo HW, foram de 1,17, 0,04, 0,15 e 0,08 Log10 UFC/cm2. Salmonella spp. foi ausente em todas amostras avaliadas, em ambos os grupos. O sistema com água aquecida reduziu as contagens bacterianas, mas diferenças estatísticas foram observadas somente em Aeróbios Mesófilos e Clostridium Sulfito-redutor. Apesar disso, seu uso pode ser um adicional ao procedimento operacional para evitar a violação dos limites microbiológicos de segurança alimentar, além de ser um sistema de fácil implementação e de baixo custo.

Abstract Salmonella Gallinarum is a host-restrict pathogen that causes fowl typhoid, a severe systemic disease that is one of the major concerns to the poultry industry worldwide. When infecting the bird, SG makes use of evasion mechanisms to survive and to replicate within macrophages. In this context, phoPQ genes encode a two-component regulatory system (PhoPQ) that regulates virulence genes responsible for adaptation of Salmonella spp. to antimicrobial factors such as low pH, antimicrobial peptides and deprivation of bivalent cations. The role of the mentioned genes to SG remains to be investigated. In the present study a phoPQ-depleted SG strain (SG ΔphoPQ) was constructed and its virulence assessed in twenty-day-old laying hens susceptible to fowl typhoid. SG ΔphoPQ did cause neither clinical signs nor mortality in birds orally challenged, being non-pathogenic. Furthermore, this strain was not recovered from livers or spleens. On the other hand, chickens challenged subcutaneously with the mutant strain had discreet to moderate pathological changes and also low bacterial counts in liver and spleen tissues. These findings show that SG ΔphoPQ is attenuated to susceptible chickens and suggest that these genes are important during chicken infection by SG.

ABSTRACT Salmonella Enteritidis causes fowl paratyphoid in poultry and is frequently associated to outbreaks of food-borne diseases in humans. The role of flagella and flagella-mediated motility into host-pathogen interplay is not fully understood and requires further investigation. In this study, one-day-old chickens were challenged orally with a wild-type strain Salmonella Enteritidis, a non-motile but fully flagellated (SE ΔmotB) or non-flagellated (SE ΔfliC) strain to evaluate their ability to colonise the intestine and spread systemically and also of eliciting gross and histopathological changes. SE ΔmotB and SE ΔfliC were recovered in significantly lower numbers from caecal contents in comparison with Salmonella Enteritidis at early stages of infection (3 and 5 dpi). The SE ΔmotB strain, which synthesises paralysed flagella, showed poorer intestinal colonisation ability than the non-flagellated SE ΔfliC. Histopathological analyses demonstrated that the flagellated strains induced more intense lymphoid reactivity in liver, ileum and caeca. Thus, in the present study the flagellar structure and motility seemed to play a role in the early stages of the intestinal colonisation by Salmonella Enteritidis in the chicken.