Due to the strong selective pressure resulting from the misuse of antibiotics, the natural process of bacterial resistance has been accelerated, leading to the increasingly constant appearance of multiresistant isolates. The high number of multiresistant bacteria is a one health problem. Enterobacteriaceae are usually commensal bacteria of the gastrointestinal tract. However, they can cause infections, and the most important resistance characteristic among them is the production of β-lactamases. This study aimed to identify ESBL-producing Enterobacteriaceae of types of TEM, SHV, and the CTX-M groups. To isolate the enterobacteria, swabs were collected by swiping objects that had contact with the patients and professionals, and the water of the hospital environment. Ten collections were carried out, yielding 306 samples, from which 118 enterobacteria were identified: Escherichia coli, Enterobacter spp., Klebsiella spp., Proteus mirabilis, Serratia spp., and Citrobacter spp. Isolates. The genes TEM and CTX-M, for the production of β lactamases, were detected in 12.7% of the 118 enterobacterial isolates. It is very important to know the bacterial population circulating in the veterinary hospital environment and its resistance to  antimicrobials so that professionals can take appropriate measures to minimize the risks of transmission, especially from cages and consultation tables. In addition, the correct control of the microbiological quality of the supply water, as well as environmental cleaning procedures, are essential to prevent the transmission of these microorganisms.

Escherichia coli is a widespread environmental pathogen frequently causing dairy cow mastitis. This bacterium is particularly capable of acquiring antimicrobial resistance, which can have severe impacts on animal food safety and human health. The objective of the study was to investigate antimicrobial resistance and genetic correlations of E. coli from dairy cow mastitis cases in northern China.

Raccoons are an invasive alien species widely distributed in the Madrid region of Spain. These animals can carry a variety of enteric bacteria with associated antimicrobial resistance, which can infect humans and livestock. However, to our knowledge, the presence of non-E. coli Enterobacteriaceae in raccoons has not been previously studied.

Most animal feeds are set from protein-rich raw materials. These protein constituents may possess various hazards, particularly highly drug-resistant pathogens, causing a bad impact not only on the pet's health, but also on their owners. In the current study, a total of 2100 pet food and 100 pets’ fecal swabs were collected and bacteriologically examined from 2017 to 2020. It was revealed that the percentage of Gram-negative bacteria isolated from pet food and fecal swabs was 49% and 56% respectively. E. coli, Proteus sp., and K. pneumoniae were the most isolated bacteria in percentages of 12.4%, 8.4%, and 4.9% respectively from Pet food and 25%, 7%, 12% respectively from pet fecal swabs. In addition, Enterobacter cloacae, P. aeruginosa, Aeromonas hydrophila, Citrobacter sp., P. fluorecens, and Y. enterocolitica were isolated from pet food in order to 3.8%, 3.5%, 3.2%, 2.6%, 2.6% and 2.1% respectively. Salmonella sp. isolated from pet food was 0.6% while it was 5% from pet fecal swabs. The most predominant salmonella serotype isolated from pet food and pet fecal swabs was S. Typhimurium. Furthermore, S. Virchow, S. Anatum, S. Kentucky, S. Kedougou and S. Infantis were isolated serotypes from Pet food in percentages of 15.7%, 23.1%, 15.4%, 7.7%, and 7.7% respectively. While S. Nitra, S. Ibargi, S. Enteritidis and S. Boecker were isolated from pet fecal swabs at a percentage of 20% for each. On the other hand, O158 was the most predominant E. coli serogroup isolated from pet food and pet fecal swabs in percentages of 30.4% and 30.8% respectively followed by O157 in percentages of 21.7% and 26.9% respectively. O26 was isolated from pet food and pet fecal swabs in percentages of 13% and 7.7% for each. O119 was isolated from pet food and pet fecal swabs in percentages of 4.3% and 3.8% respectively. O86, O27, O44, O55, and O78 were isolated from pet food in the percentage of 4.3%, 8.7%, 4.3%, 4.3%, and 8.7%respectively. While O114, O111, and O125 were isolated serotypes from pet fecal swabs in percentages of 15.4%, 3.8%, and 11.5% respectively. This study revealed that the antimicrobial sensitivity test of 80% of Salmonellae were resistant to Cefotaxime and Colistin sulphate while 50%, 30, and 20% of isolates were resistant to Gentamicin, Tetracycline, and Cefepime respectively, while 40% of Salmonellae were resistant to Chloramphenicol, Enrofloxacin, and Amoxicillin-clavulanate. Also 60% of Salmonellae showed resistance to Trimethoprim sulfamethoxazole and Ciprofloxacin. Detection of Extended-spectrum ß-lactamase resistance genes (blaTEM, blaSHV, and blaCTX-M) in Pets using Polymerase chain reaction (PCR) showed the presence of blaTEM and blaSHV genes in all tested isolates in 12 samples out of 12 (100%) and has shown that the ratio of blaCTX-M is 5 out of 12samples (41.6 %).