ABSTRACT
Serratia marcescens is a Gram-negative bacterium presenting intrinsic resistance to polymyxins that has emerged as an important human pathogen. Although previous studies reported the occurrence of multidrug-resistance (MDR) S. marcescens isolates in the nosocomial settings, herein, we described isolates of this extensively drug-resistant (XDR) species recovered from stool samples of food-producing animals in the Brazilian Amazon region. Three carbapenem-resistant S. marcescens strains were recovered from stool samples of poultry and cattle. Genetic similarity analysis showed that these strains belonged to the same clone. Whole-genome sequencing of a representative strain (SMA412) revealed a resistome composed of genes encoding resistance to ß-lactams [blaKPC-2, blaSRT-2], aminoglycosides [aac(6')-Ib3, aac(6')-Ic, aph(3')-VIa], quinolones [aac(6')-Ib-cr], sulfonamides [sul2], and tetracyclines [tet(41)]. In addition, the analysis of the virulome demonstrated the presence of important genes involved in the pathogenicity of this species (lipBCD, pigP, flhC, flhD, phlA, shlA, and shlB). Our data demonstrate that food-animal production can act as reservoirs for MDR and virulent strains of S. marcescens.
ABSTRACT
Com o intuito de determinar a frequência de bactérias enteropatogênicas e enteroparasitas em pacientes com diarreia aguda no Município de Juruti, Pará, o qual passa por intenso processo imigratório face o grande projeto de exploração mineral, avaliaram-se 263 casos de diarreia aguda, dos quais 19 por cento foram atribuídos a bactérias enteropatogênicas, destacando-se a Shigella spp, que representou 13,7 por cento. Salmonella spp, Aeromonas spp e Plesiomonas shigelloides também foram detectados. Os sorotipos de Shigella mais frequentemente encontrados foram S. flexneri (61,1 por cento) e S. sonnei (38,9 por cento). Entre as Salmonella, identificaram-se os seguintes sorotipos: S. Panama (2), S. Newport (2), S. Bredeney, S. Saintpaul e S. Gaminara. A infecção pelos protozoários alcançou 85,3 por cento tendo como principais responsáveis, por ordem de frequência, Blastocystis hominis (37,3 por cento), Entamoeba histolytica/E. dispar (22,8 por cento), Endolimax nana (16,7 por cento), Entamoeba coli (9,5 por cento) e Giardia lamblia (8,4 por cento). Esses resultados fornecem valiosos subsídios à vigilância epidemiológica e ambiental, demonstrando as condições insatisfatórias de saneamento básico em que vive a população do Município.
With the aim of determining the frequency rate of enteropathogenic bacteria and enteroparasites in patients with acute diarrhea in the Municipality of Juruti, Pará State, which has been facing an intense migratory process due to a great mining project, we analyzed 263 cases of acute diarrhea. A total of 19 percent of those cases were related to enteropathogenic bacteria, particularly Shigella spp. that accounted for 13.7 percent of the cases. Salmonella spp, Aeromonas spp and Plesiomonas shigeloide were also detected. The most frequent Shigella serotypes found were S. flexneri (61.1 percent) and S. sonnei (38.9 percent). Among the Salmonella, we could observe the following serotypes: S. Panama (2), S. Newport (2), S. Bredeney, S. Saintpaul and S. Gaminara. The infection caused by protozoa reached 85.3 percent, mostly due to Blastocystis hominis (37.3 percent), Entamoeba histolytica/E. dispar (22.8 percent), Endolimax nana (16.7 percent), Entamoeba coli (9.5 percent) and Giardia lamblia (8.4 percent). These results provide valuable data to epidemiological and environmental surveillance because it presents the unsatisfactory basic sanitary conditions of the local population.
