Hospital-acquired infections in operating rooms are contributing factors to the increasing presence of pathogens, with surgical site infections being the most frequent among them. Surgical antimicrobial prophylaxis is administered to minimize the risk of developing surgical site infection. Surgeons are responsible for weighing the benefit of surgical site infection-risk reduction for the individual patient afforded by prophylactic antimicrobial administration against the broader societal risk from such use. The aim of this study was to analyze the data on surgical antimicrobial prophylaxis related to patient status, surgery duration, wound classification and the occurrence of surgical site infection in two operating rooms of the Veterinary Teaching Hospital of Naples from January 2023 to January 2024. Two hundred seventy-seven surgical procedures met the inclusion criteria. For soft tissue clean-contaminated procedures and clean orthopedic surgeries not involving implants, no statistically significant difference was observed between the various antibiotic protocols used and surgical site infection; this finding supports the possibility of avoiding antibiotic use for these procedures. In contrast to previous reports, this study identified a statistically significant association between ASA status and surgical site infection; no correlation was found between surgical duration and the occurrence of infection. Further research on antibiotic use and risk factors associated with surgical site infection will be crucial to strengthen clinical guidelines.

(1) Background: postoperative surgical-site infections are a significant complication in small-animal surgical procedures, with detected rates ranging from 0.8% to 18.1%, depending on the type of surgery. The sterilization process of surgical instruments is a crucial factor in infection control, but the shelf life of surgical instruments and the best packaging method are not precisely defined due to the multiple variables that influence them. This study aimed to assess the shelf life of surgical instruments stored under controlled environmental conditions in a veterinary hospital and compare two packaging methods: using a self-sealing single pouch versus a self-sealing double pouch. (2) Methods: a sample of 400 non-sterile screws was divided into three groups: Group 1 (175 screws in single pouches), Group 2 (175 screws in double pouches), and Group 3 (50 non-sterile screws as a control group to verify the microbial culture efficiency). Microbiological tests were conducted at 1, 7, 15, 30, 60, 182, and 390 days post-sterilization. (3) Results: no bacterial growth was detected on screws packaged in single and double pouches up to 182 days. However, after 390 days, bacterial growth was observed in one screw packaged in a single pouch. In Group 3, only two screws turned out to be bacteriologically positive. (4) Conclusions: no statistical difference was found between the two groups; however, the detection of a single positive screw in the single-pouch group raised a potential clinical consideration, suggesting the need for further studies based on events and time.

The skin of turtles, particularly aquatic species, can harbor a diverse range of bacteria, including Citrobacter species, which are recognized as causative agents of Septicemic Cutaneous Ulcerative Disease. Consequently, turtles may act as reservoirs of pathogenic and multidrug-resistant bacteria, posing a potential public health concern. This case-based study investigated the presence of Citrobacter spp. in a loggerhead sea turtle (Caretta caretta) housed at the Livorno Aquarium, Italy. Nine swabs were collected from skin lesions (plastron, carapace, nuchal mass), the oral cavity, and the cloaca. The isolated strains were identified by MALDI-TOF MS and tested for their susceptibility to 12 antimicrobials, belonging to eight antimicrobial classes, by the disc diffusion method. Isolates were investigated genotypically for extended-spectrum-β-lactamase (ESBL) bla_CTX−M, bla_TEM, bla_SHV, bla_PER, and metallo-β-lactamase (MBL) bla_IMP, bla_OXA−48, bla_VIM, bla_NDM, bla_GES genes. Biofilm production ability was also evaluated. Fifteen Citrobacter spp. strains were recovered from the analyzed samples. Complete resistance was recorded for ampicillin, followed by high levels of resistance to imipenem, tetracycline and piperacillin-tazobactam. Worryingly, 86.7% were classified as multidrug-resistant. The most common ESBL-genotype combination was bla_SHV and bla_PER genes (60%), while the most frequently detected MBL gene was bla_NDM (46.7%), followed by bla_GES (40%). Most isolates were classified as weak biofilm producers (80%). The findings of this study demonstrate the presence of Citrobacter spp., an opportunistic pathogen, with a notable prevalence of multidrug-resistant strains carrying beta-lactamase-encoding genes, in a loggerhead sea turtle in Italy, across both lesioned and healthy anatomical sites.

Animal health is a key pillar of the One Health framework, which emphasizes the interconnectedness of humans, animals, and the environment. Staphylococcus spp., common commensals of skin and mucosa, are clinically important due to their virulence factors and increasing antimicrobial resistance. This cross-sectional study aimed to isolate and characterize Staphylococcus spp. from dogs and their owners and to assess correlations within their nasal microbiota. Nasal swabs were collected from at least 100 dog–owner pairs at two Veterinary Teaching Hospitals located in Northern (Turin Province) and Southern (Naples Province) Italy. In both study areas, S. pseudintermedius was the most common species in dogs. Among owners, S. epidermidis was predominant in Naples, while S. epidermidis and S. aureus were most frequent in Turin. A subset of 54 dog–owner pairs sharing the same Staphylococcus species (42 from Turin and 12 from Naples; in total 108 isolates) was included in this analysis, with a focus on antimicrobial patterns. S. aureus was the species most frequently shared between dogs and owners, followed by S. epidermidis, with no significant differences between the two sites. In particular, methicillin resistance (phenotypically inferred) was detected in 16.7% of isolates in Turin (19.0% in dogs; 14.3% in owners) and 41.7% of isolates in Naples (33.3% in dogs; 50.0% in owners). Multidrug resistance was detected in 34.3% of paired isolates overall, with a higher prevalence in Naples (58.3%) compared to Turin (27.4%). No significant association emerged between biofilm production and multidrug resistance (MDR). Overall, these findings suggest possible species sharing between dogs and owners, while biofilm formation did not predict MDR.

From an ecological epidemiology perspective, wildlife nasal cavities may serve as critical ecological niches for the maintenance and spread of bacterial pathogens relevant to both animal and human health. This study investigated Streptococcus spp. as the most prevalent genus in the nasal cavities of 82 wild boars (Sus scrofa), sampled across six hunting districts in Avellino Province (Southern Italy), assessing the diversity of the colonizing streptococcal populations and their antimicrobial resistance profiles. The sampled population consisted of 43 males (52%) and 39 females (48%). A total of 173 Gram-positive isolates were recovered, with 74 identified as Streptococcus spp. by MALDI-TOF MS. These isolates originated from 59 positive swabs (72%; 59/82). Streptococcus gallolyticus was the most prevalent species (41%; 30/74), followed by Streptococcus porcinus (27%; 20/74) and Streptococcus suis (19%; 14/74). No statistically significant geographic association was found across sampling districts (p = 0.491), whereas a significant association was found between bacterial species and antimicrobial resistance profiles (χ² = 16.70, p < 0.001). Specifically, all Streptococcus porcinus isolates (100%; 20/20) exhibited resistance to sulfamethoxazole–trimethoprim and tetracycline, while high tetracycline resistance was also noted in Streptococcus suis (93%; 13/14) and Streptococcus gallolyticus (83%; 25/30). Overall, 69% (51/74) of isolates were classified as MDR and 5% (4/74) as XDR. These findings suggest the potential role of wild boars as reservoirs for antimicrobial-resistant streptococci, emphasizing the need for continuous surveillance under a One Health framework.

Wild boars (Sus scrofa) are reliable bioindicator species for assessing environmental pollution. In this pilot study, we measured concentrations of arsenic (As), cadmium (Cd), copper (Cu), selenium (Se), zinc (Zn), and lead (Pb) in liver, diaphragm, and testicular tissues from wild boars collected across seven districts of Avellino province (liver/diaphragm: n = 87; testicles: n = 50). Pb reached its highest median value in the diaphragm (0.43 mg/kg w.w.; maximum 14.80 mg/kg), while Cd showed a pronounced affinity for hepatic tissue (median 0.15 mg/kg; maximum 0.62 mg/kg). Zn was the most abundant element overall, particularly in the diaphragm (median 20.51 mg/kg; maximum 46.81 mg/kg). Se concentrations were generally below the detection limit (<0.001 mg/kg), with only occasional outliers. Sex-related differences were evident: males accumulated more Pb in the liver, while females had higher levels of Cd and As. Spatial patterns identified AVMFS009 and AVAR009 as hotspots for Cu, Zn, and Cd, while AVCP003 emerged as the main hotspot for As. Overall, the results reinforce the role of wild boars as effective bioindicators in southern Italy.