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Attributable sources of the five most prevalent non-typhoidal Salmonella serova...
Teunis, Gijs; Dallman, Timothy J.; Zajac, Magdalena; Skarżyńska, Magdalena; Petrovska, Liljana; Pista, Ângela; Silveira, Leonor; Clemente, LurdesNon-typhoidal Salmonella is the second most frequently reported zoonotic pathogen in the European Union and European Economic Area. Most human infections are caused by serovars Enteritidis and Typhimurium. Genomic characterisation of Salmonella isolates from humans and animals has become a routine public health surveillance tool in many countries. In this study, the relative contributions of several potential s...
Uropathogenic Escherichia coli in a Diabetic Dog with Recurrent UTIs: Genomic I...
Rodrigues, Inês C.; Ribeiro-Almeida, Marisa; Campos, Joana; Silveira, Leonor; Leite-Martins, Liliana; Ribeiro, Jorge; da Costa, Paula MartinsRecurrent urinary tract infections (UTIs) pose a significant clinical challenge in both human and veterinary medicine, due to antibiotic-resistant and biofilm-forming bacteria. We hypothesized that high glucose levels in diabetic animals enhance biofilm formation and reduce antibiotic efficacy, promoting infection persistence. This study analyzed Escherichia coli from a diabetic female Labrador Retriever with r...
Antimicrobial resistance of Salmonella Typhi and Paratyphi isolates in Portugal...
Pista, Ângela; Henriques, Ana Margarida; Caeiro, Raquel; Tomás, Alexandra; Silveira, LeonorIntrodution: Typhoid and paratyphoid fever are severe systemic infections caused by Salmonella (S.) enterica subspecies enterica serovars Typhi and Paratyphi A, B and C. Transmission occurs primarily through ingestion of food or water contamined with faeces from infected individuals or via direct person-to person contact. In Europe, enteric fever is rare and mainly associated with travel to endemic countries. T...
Salmonella spp. isolates in Portugal, 2024
Silveira, Leonor; Caeiro, Raquel; Henriques, Ana Margarida; Tomás, Alexandra; Pista, ÂngelaBackground: Salmonella spp. remains one of the main causes of gastrointestinal infections in the European Union, only preceded by Campylobacter spp. The most common serovars of Salmonella spp. causing illness are Salmonella enterica enterica serovar Enteritidis, Typhimurium and the monophasic variant of Typhimurium (4,[5]:i:-). The aim of this study was to evaluate the Salmonella spp. isolates circulating in Po...
Genetic Diversity of Salmonella enterica subsp. enterica Serovar Enteritidis fr...
Leão, Célia; Silveira, Leonor; Usié, Ana; Gião, Joana; Clemente, Lurdes; Themudo, Patricia; Amaro, Ana; Pista, AngelaSalmonella enterica subsp. enterica serovar Enteritidis (S. Enteritidis) is one of the leading causes of foodborne infections associated with broilers and laying hens. Portugal has had the lowest notification rates of salmonellosis in recent years, due to the vaccinations of layer and breeder flocks and strict compliance with biosecurity measures. However, data about the genetic diversity of S. Enteritidis in P...
Genomic epidemiology of fluoroquinolone-resistant strains of Shigella sonnei an...
Jacqueline, Camille; Minetti, Corrado; Monzon Fernandez, Sara; Silveira, Leonor; Cuesta De La Plaza, Isabel; Pista, Ângela; Herrera-Leon, SilviaFluoroquinolone-resistance in Shigella is among the serious antimicrobial resistance (AMR) threats. We investigated the genomic epidemiology of fluoroquinolone resistant (FQR) strains of S. sonnei and S. flexneri from 2015 to 2022 in Spain and Portugal. We determined the AMR profiles of 416 isolates (S. flexneri and S. sonnei) and FQR isolates were subjected to whole-genome sequencing. The percentage of FQR iso...
Phenotypic and Genotypic Characterization of Escherichia coli and Salmonella sp...
Gonçalves, Carlota; Silveira, Leonor; Rodrigues, João; Furtado, Rosália; Ramos, Sónia; Nunes, Alexandra; Pista, ÂngelaBackground: Foodborne diseases are a serious public health concern, and food-producing animals are a major source of contamination. Methods: The present study analysed Escherichia coli and Salmonella spp. isolated from faecal samples of 100 fattening pigs and from 52 samples of pork meat. Results: The results showed that the majority of the analysed meat samples were considered satisfactory in terms of microbio...
Unveiling a Listeria monocytogenes Outbreak in a Rabbit Farm: Clinical Manifest...
Rodrigues, Inês C.; Ribeiro-Almeida, Marisa; Silveira, Leonor; Prata, Joana C.; de Carvalho, André Pinto; Roque, Carla; Gomes, João Paulo; Borges, VítorListeria monocytogenes poses a threat to both human and animal health. This work describes an L. monocytogenes outbreak in a Portuguese rabbit farm, detailing the isolates’ clinical manifestations, necropsy findings, and phenotypic and genomic profiles. Clinical signs, exclusively observed in does, included lethargy and reproductive signs. Post-mortem examination of does revealed splenomegaly, hepatomegaly with...
Unlocking success: the crucial role of good clinical practices in veterinary pr...
Rodrigues, Inês C.; Ribeiro-Almeida, Marisa; Ribeiro, Jorge; Silveira, Leonor; C. Prata, Joana; Pista, Ângela; Martins da Costa, PauloBackground: Antimicrobial resistance (AMR) poses a global health challenge, impacting both humans and animals [1]. The emergence and spread of antibiotic-resistant bacteria among pets heighten the risk of transmission to humans or animals, given their close interaction [2]. Objective: This study aimed to underscore the importance of implementing good clinical practices in veterinary medicine, using a clini...
Aumento de casos de Salmonella Typhimurium em 2024: caracterização fenotípica e...
Tomás, Alexandra; Henriques, Ana Margarida; Caeiro, Raquel; Pista, Angela; Silveira, LeonorSalmonelose é a segunda zoonose mais frequente a nível mundial. É causada por Salmonella enterica, sendo S. Typhimurium um dos serotipos mais reportados na União Europeia. Um dos maiores riscos para a saúde pública é a presença de Salmonella spp. em alimentos, e consequente associação a surtos que podem atingir uma dimensão transfronteiriça. Este estudo teve como principal objetivo caraterizar fenotípica e geno...