Feline otitis externa caused by methicillin-resistant Staphylococcus aureus with mixed hemolytic phenotype and overview of possible genetic backgrounds

Avberšek, Jana (author), Papić, Bojan (author), Kušar, Darja (author), Erjavec, Vladimira (author), Seme, Katja (author), Golob, Majda (author), Zdovc, Irena (author)

Methicillin-resistant Staphylococcus aureus (MRSA) is an important cause of nosocomial infections in humans, but its importance in small animal practice is increasing. Here, we present a case of feline otitis externa (OE) caused by MRSA; both hemolytic and nonhemolytic variants with a stable phenotype were recovered from the external auditory canal after infection was detected by routine otoscopy. One isolate per variant underwent antimicrobial susceptibility testing (AST) by broth microdilution method, conventional spa typing and whole-genome sequencing (WGS). The results showed that both variants were genetically related and were of sequence type (ST) 1327, SCCmec type IV and spa type t005. AST and WGS showed that both isolates were resistant to β-lactams and sensitive to all tested non-β-lactam antibiotics. Both isolates were pvl-negative, but encoded several other virulence genes (aur, hlgABC, sak, scn, seg, sei, sem, sen, seo and seu). Genetic background of the mixed hemolytic phenotype was not identified; no differences in the agr locus or other regulatory regions were detected. Three single-nucleotide polymorphisms were identified but could not be associated with hemolysis. This well-documented case of MRSA infection in companion animals adds to the reports of MRSA infections with a mixed hemolytic phenotype.

• Language: English
• Keywords: methicillin-resistant Staphylococcus aureus (MRSA), otitis externa, cat, whole-genome sequencing (WGS), mixed hemolysis, genetics, microbiology
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: VF - Veterinary Faculty; MF - Faculty of Medicine
• Publication status: Published
• Publication version: Version of Record
• Year: 2021
• Number of pages: 11 str.
• Numbering: Vol. 10, iss. 5, art. 599
• PID: 20.500.12556/RUL-132094
• UDC: 636.8.09:579:57.08
• ISSN on article: 2079-6382
• DOI: 10.3390/antibiotics10050599
• COBISS.SI-ID: 64125443
• Publication date in RUL: 12.10.2021

AVBERŠEK, Jana, PAPIĆ, Bojan, KUŠAR, Darja, ERJAVEC, Vladimira, SEME, Katja, GOLOB, Majda and ZDOVC, Irena, 2021, Feline otitis externa caused by methicillin-resistant Staphylococcus aureus with mixed hemolytic phenotype and overview of possible genetic backgrounds. Antibiotics [online]. 2021. Vol. 10, no. 5,  599. [Accessed 29 March 2025]. DOI 10.3390/antibiotics10050599. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=132094

Record is a part of a journal

• Title: Antibiotics
• Publisher: MDPI
• ISSN: 2079-6382
• COBISS.SI-ID: 522975769

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 18.05.2021

Secondary language

• Language: Slovenian
• Keywords: veterinarska medicina

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: J4-8224
• Name: Ugotavljanje in karakterizacija povzročiteljev kužnih bolezni z metodo naslednje generacije sekvenciranja

• Funder: ARRS - Slovenian Research Agency
• Project number: P4-0092
• Name: Zdravje živali, okolje in varna hrana