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Sepsis is a life-threatening organ dysfunction caused by a patient’s unregulated response to an infectious process. In veterinary medicine, the exact incidence of sepsis is unknown. Early recognition of sepsis in critically ill patients is essential for rapid and effective therapeutic intervention. The present study aimed to apply the criteria of an adapted sepsis assessment protocol based on the Second International Consensus Definition for Sepsis and Septic Shock or Sepsis-2 of human medicine, in canine patients with suspected systemic inflammatory response syndrome (SIRS) and/or organ dysfunction, and to identify infectious agents as well as their antimicrobial resistance profile in the focus of infection, in the bloodstream and colonizing the rectal mucosa. Patients were evaluated for survival and severity of sepsis. Of the 37/42 dogs that met the sepsis criteria, six presented septic shock, 26 (70.2%) had at least two signs of SIRS, and sepsis with organ dysfunction was diagnosed in 27 (73%) dogs. The primary dysfunctions observed were decreased level of consciousness in 21/37 (56.8%), hyperlactatemia in 19/37 (51.4%), and hypoalbuminemia in 18/37 (48.6%). Two or more SIRS signs associated with hypotension and hypoalbuminemia were related to more than half of the deaths. The most frequent infectious focus was skin and soft tissue in 20/37 (54%), followed by organs and cavities in 8/37 (21.6%). The survival rate was 56.7%. Blood culture confirmed bacteremia in nine patients (24.3%), with a predominance of Gram-positive microorganisms (Staphylococcus intermedius, Streptococcus spp.) in 66.6% of dogs and one yeast (Candida glabrata). The most frequent bacteria in the focus of infection were gram-negative bacteria (46.2%), mainly Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa, in 19.5%, 14.6%, and 12.1%, respectively. We observed colonization by gram-negative bacteria such as E. coli-ESBL (31.5%), K. pneumoniae-ESBL (15.7%), and P. aeruginosa (15.7%), and the presence of ESBL bacteria was more associated with death when compared with other microorganisms. Vancomycin-resistant Enterococcus (VRE) were isolated from rectal mucosa in four dogs. Gram-negative microorganisms were the most frequent in both infections and colonization, and most of them were resistant to fluoroquinolones, sulfonamides, tetracyclines, and cephalosporins. Based on this information, it can be concluded that mortality due to sepsis in dogs was high. Due to the presence of multi-resistant bacteria, the use of antimicrobials should be judicious, suggesting the implementation of the same precautions used in human hospitals to prevent the spread of multi-resistant microorganisms.

Clinical and microbiological characteristics of dogs in sepsis in an academic veterinary hospital in the north of Paraná