{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,21]],"date-time":"2026-04-21T02:30:00Z","timestamp":1776738600156,"version":"3.51.2"},"reference-count":83,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2021,5,27]],"date-time":"2021-05-27T00:00:00Z","timestamp":1622073600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100009091","name":"FCT","doi-asserted-by":"publisher","award":["Project UIDB\/00276\/2020"],"award-info":[{"award-number":["Project UIDB\/00276\/2020"]}],"id":[{"id":"10.13039\/501100009091","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Antibiotics"],"abstract":"<jats:p>Hospital-acquired infections (HAIs) are a rising problem worldwide, and the best way of coping with them is through infection tracking and surveillance systems, combined with prevention strategies, namely efficient disinfection protocols, that employ various biocides. However, increasing reports about reductions in biocide susceptibility and the development of cross-resistance to antimicrobials emphasize the need for identifying the factors influencing biocide efficiency. In this study, 29 bacterial isolates (n = 3 E. coli, n = 2 Pseudomonas spp., n = 23 Enterococcus spp., and n = 1 Staphylococcus pseudintermedius), obtained from environmental samples collected from the Biological Isolation and Containment Unit (BICU), of the Veterinary Teaching Hospital of the Faculty of Veterinary Medicine, University of Lisbon, were tested in order to determine their antimicrobial susceptibility to various antibiotics. Thirteen of these isolates were further selected in order to determine their antimicrobial susceptibility to Virkon\u2122 S, with and without the presence of organic matter. Afterward, seven of these isolates were incubated in the presence of sub-lethal concentrations of this formulation and, subsequently, new susceptibility profiles were determined. Fourteen of the 29 isolates (48.3%) were classified as multidrug resistant, all previously identified as enterococci. Concerning Virkon\u2122 S\u2019s susceptibility, the Minimal Bactericidal Concentration (MBC) of this biocide regarding all isolates was at least eight times lower than the concentration regularly used, when no organic matter was present. However, when organic matter was added, MBC values rose up to 23 times. After exposure to sub-lethal concentrations of Virkon\u2122 S, four enterococci presented a phenotypical change regarding antimicrobial susceptibility towards gentamicin. Virkon\u2122 S also resulted in higher MBC values, up to 1.5 times, in the presence of low concentrations of organic matter, but no rise in these values was observed in assays without interfering substance. Virkon\u2122 S seemed to be an efficient formulation in eliminating all bacteria isolates isolated from the BICU. However, organic matter could represent a hindrance to this ability, which emphasizes the importance of sanitization before disinfection procedures. The changes seen in antimicrobial susceptibility could be explained by a general stress-induced response promoted by the sub-lethal levels of Virkon\u2122 S. Additionally, when no organic matter was present, a decrease in susceptibility to this biocide seemed to be non-existent.<\/jats:p>","DOI":"10.3390\/antibiotics10060639","type":"journal-article","created":{"date-parts":[[2021,5,27]],"date-time":"2021-05-27T04:30:46Z","timestamp":1622089846000},"page":"639","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Evaluation of a Biocide Used in the Biological Isolation and Containment Unit of a Veterinary Teaching Hospital"],"prefix":"10.3390","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7885-1820","authenticated-orcid":false,"given":"Catarina","family":"Geraldes","sequence":"first","affiliation":[{"name":"Faculty of Veterinary Medicine, University of Lisbon, Av. Universidade T\u00e9cnica, 1300-477 Lisboa, Portugal"}]},{"given":"Cl\u00e1udia","family":"Verdial","sequence":"additional","affiliation":[{"name":"Faculty of Veterinary Medicine, University of Lisbon, Av. Universidade T\u00e9cnica, 1300-477 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5641-4400","authenticated-orcid":false,"given":"Eva","family":"Cunha","sequence":"additional","affiliation":[{"name":"Faculty of Veterinary Medicine, University of Lisbon, Av. Universidade T\u00e9cnica, 1300-477 Lisboa, Portugal"},{"name":"Centre for Interdisciplinary Research in Animal Health (CIISA), Faculty of Veterinary Medicine, University of Lisbon, Av. Universidade T\u00e9cnica, 1300-477 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5902-132X","authenticated-orcid":false,"given":"Virg\u00edlio","family":"Almeida","sequence":"additional","affiliation":[{"name":"Faculty of Veterinary Medicine, University of Lisbon, Av. Universidade T\u00e9cnica, 1300-477 Lisboa, Portugal"},{"name":"Centre for Interdisciplinary Research in Animal Health (CIISA), Faculty of Veterinary Medicine, University of Lisbon, Av. Universidade T\u00e9cnica, 1300-477 Lisboa, Portugal"}]},{"given":"Lu\u00eds","family":"Tavares","sequence":"additional","affiliation":[{"name":"Faculty of Veterinary Medicine, University of Lisbon, Av. Universidade T\u00e9cnica, 1300-477 Lisboa, Portugal"},{"name":"Centre for Interdisciplinary Research in Animal Health (CIISA), Faculty of Veterinary Medicine, University of Lisbon, Av. Universidade T\u00e9cnica, 1300-477 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3910-1525","authenticated-orcid":false,"given":"Manuela","family":"Oliveira","sequence":"additional","affiliation":[{"name":"Faculty of Veterinary Medicine, University of Lisbon, Av. Universidade T\u00e9cnica, 1300-477 Lisboa, Portugal"},{"name":"Centre for Interdisciplinary Research in Animal Health (CIISA), Faculty of Veterinary Medicine, University of Lisbon, Av. Universidade T\u00e9cnica, 1300-477 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9565-6261","authenticated-orcid":false,"given":"Solange","family":"Gil","sequence":"additional","affiliation":[{"name":"Faculty of Veterinary Medicine, University of Lisbon, Av. Universidade T\u00e9cnica, 1300-477 Lisboa, Portugal"},{"name":"Centre for Interdisciplinary Research in Animal Health (CIISA), Faculty of Veterinary Medicine, University of Lisbon, Av. Universidade T\u00e9cnica, 1300-477 Lisboa, Portugal"},{"name":"Biological Isolation and Containment Unit (BICU), Teaching Hospital, Faculty of Veterinary Medicine, University of Lisbon, Av. Universidade T\u00e9cnica, 1300-477 Lisboa, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2021,5,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"307","DOI":"10.1016\/j.tvjl.2012.04.005","article-title":"Veterinary hospital-acquired infections: The challenge of MRSA and other multidrug-resistant bacterial infections in veterinary medicine","volume":"193","author":"Guardabassi","year":"2012","journal-title":"Vet. J."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"217","DOI":"10.1016\/j.cvsm.2014.11.009","article-title":"Hospital-Associated Infections in Small Animal Practice","volume":"45","author":"Stull","year":"2015","journal-title":"Vet. Clin. N. Am. Small Anim. Pract."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"507","DOI":"10.1111\/j.1748-5827.2011.01140.x","article-title":"Infection control in veterinary practice; the time is now","volume":"52","author":"Weese","year":"2011","journal-title":"J. Small Anim. 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