ENOVAT review questions routine surgical antibiotic prophylaxis: full analysis

A new ENOVAT-backed systematic review and meta-analysis is sharpening the case for tighter antimicrobial stewardship in small animal surgery. Published in the Journal of Small Animal Practice, the review found that surgical antimicrobial prophylaxis produced only trivial to small reductions in surgical site infection risk across a range of procedures in dogs and cats, rather than broad, clearly clinically meaningful benefit. (pubmed.ncbi.nlm.nih.gov)

That review is part of a longer guideline effort from the European Network for Optimization of Veterinary Antimicrobial Therapy, or ENOVAT, which has been building evidence-based veterinary antimicrobial guidance for several years. ENOVAT previously described surgical prophylaxis as a priority area, and outside commentary late in 2025 framed the forthcoming recommendations as the product of years of review work. The broader backdrop is growing pressure, in both Europe and companion animal practice more generally, to limit prophylactic antimicrobial use unless there is a clear indication. (pmc.ncbi.nlm.nih.gov)

The review itself included eight randomized controlled trials and seven observational studies. Investigators organized the evidence into nine surgery and wound-classification subgroups, including neutering, other clean soft tissue procedures, urologic and gastrointestinal surgery, clean-contaminated procedures, orthopedic surgery with and without implants, and TPLO. Using GRADE methods, the authors concluded that evidence ranged from very low to moderate certainty, and that the overall effect of prophylaxis on surgical site infection incidence was small at best. The paper’s stated clinical significance is straightforward: the results were intended to support evidence-based treatment guidelines. (pubmed.ncbi.nlm.nih.gov)

Those findings fed into the ENOVAT 2025 guideline, also published in JSAP. According to the PubMed abstract, the multidisciplinary panel developed recommendations for peri- and post-operative prophylaxis across soft tissue and orthopedic procedures in dogs and cats, incorporating practitioner input for real-world applicability. The final output was notably restrictive: 10 strong recommendations against surgical antimicrobial prophylaxis, three conditional recommendations against, and five conditional recommendations for it. The guideline authors said strong recommendations against use were often supported by low- to very low-certainty evidence of no benefit, balanced against the established harms of antimicrobial exposure. (pubmed.ncbi.nlm.nih.gov)

There was also some outside expert and industry reaction pointing in the same direction. A post on the Worms & Germs blog, written by infectious disease specialist Dr. J. Scott Weese, described the ENOVAT document as the culmination of several years of work and linked it to the earlier scoping review and the then-forthcoming systematic review. Separate recent studies in veterinary surgery and dentistry also suggest this is not an isolated signal: one retrospective study reported that postoperative prophylactic antibiotics were not associated with fewer surgical site infections after hemilaminectomy in dogs, while survey and prescribing studies have documented wide variation and frequent prophylactic use in areas where evidence is limited or guidelines have been lacking. (wormsandgermsblog.com)

Why it matters: For veterinary teams, this review-guideline package gives stronger footing for changing long-standing habits around “just in case” antibiotic use. It reinforces that clean procedures, including many routine soft tissue surgeries, may not benefit meaningfully from prophylaxis when aseptic technique, tissue handling, and perioperative protocols are sound. That is consistent with the 2022 AAHA/AAFP antimicrobial stewardship guidance, which says prophylaxis is not usually needed for clean procedures and that ongoing postoperative therapy is rarely required, and with Washington State University’s 2025 companion animal antimicrobial use guide, which says antibiotics are not warranted for routine surgical procedures. For practices trying to standardize protocols, reduce unnecessary prescribing, and communicate clearly with pet parents, the ENOVAT work offers an evidence-based framework rather than a one-size-fits-all ban. (aaha.org)

The nuance is important. The guideline does not say prophylaxis is never appropriate; it says use should be targeted, procedure-specific, and justified by likely benefit. That matters most in higher-risk surgeries, implant cases, or situations where contamination risk, patient factors, or consequences of infection materially change the balance. Because the underlying evidence was often low certainty, local surveillance, audit data, and case mix will still matter when hospitals translate the guidance into protocol. That is an inference based on the guideline’s mix of strong and conditional recommendations, and on its explicit invitation for national and regional groups to adapt the evidence into local guidance. (pubmed.ncbi.nlm.nih.gov)

What to watch: The next step is implementation: expect national bodies, specialty groups, and individual hospitals to adapt the ENOVAT recommendations into local surgical prophylaxis pathways, with close attention to peri-operative timing, postoperative duration, and which procedures truly merit antimicrobial coverage. (pubmed.ncbi.nlm.nih.gov)