Aim: The study aimed to detect the invA gene in Salmonella isolated from milkfish in the Sidoarjo wet fish market. Materials and Methods: A total of 84 samples were prepared in enrichment media and isolated on the surface of Salmonella Shigella Agar. Salmonella growth produces transparent colonies with blackish color in the middle due to H2S gas formation. Samples were identified as Salmonella based on macroscopic colony morphology. Presumptive Salmonella sp. was put on Bismuth Sulfite Agar media. Salmonella was determined based on the results of the biochemical test that has been carried out using Microbact identification kits from negative gram staining. Results: The results of this study indicate that 32 of 84 samples (38.09%) were Salmonella bacteria. Furthermore, the invA gene detection was carried out using the polymerase chain reaction technique. Electrophoresis results showed four positive samples contained invA gene with a length of 284 bp. Conclusion: Results in this study indicate that contamination of milkfish with Salmonella needs strict hygienic measures to prevent their transmission to human.

Wibisono FJ, Sumiarto B, Untari T, Effendi MH, Permatasari DA, Witaningrum AM. 2020. Short Communication: The presence of extended-spectrum beta-lactamase (ESBL) producing Escherichia coli on layer chicken farms in Blitar Area, Indonesia. Biodiversitas 21: 2667-2671. This study was aimed to determine the incidence of Extended-Spectrum Beta-Lactamase (ESBL) producing Escherichia coli on layer chicken in Blitar area. This was a cross-sectional study with a total of 205 cloacal swabs of layer chicken taken randomly. The sample was in isolation identification on MacConkey media and ESBL confirmation test produced by Escherichia coli was then carried out by the Double Disc Synergy Test (DDST) method and the VITEK® 2 Compact Automated System method. This study showed that 185 (90.24%) isolates of positive Escherichia coli from a total of 205 samples of cloacal swabs of the layer chicken. The incidence of ESBL-producing Escherichia coli in cloacal swabs on layer chicken with the Double Disc Synergy Test (DDST) method and the VITEK® 2 compact automatic method was 13 (7.03%). Results in this study indicated that layer chicken has potential as reservoir for spreading ESBL to public health and needs strict hygienic measures to prevent their transmission to humans.

Stray cats survive by getting food or drink that is available in the environment, correspondingly, stray cats have relatively high exposure to antibiotic resistance obtained from resistant bacteria found in the environment. The present study was conducted to determine patterns of multidrug resistance and Escherichia coli resistance in stray cats. A total of 50 stray cat anal swab samples were taken randomly from the previously recorded stray cat population in the Surabaya area, East Java, Indonesia. Samples were brought using buffered peptone water. They were cultured on MacConkay Agar differential selective media, and all suspicious colonies of Escherichia coli were examined by biochemical tests. Isolates were then identified, and susceptibility testing was performed according to the Clinical and Laboratory Standards Institute. The results of the resistance test indicated that the multidrug resistance in Escherichia coli bacteria taken from cats was 14.6% (7/48). The high antibiotic resistance of Escherichia coli bacteria in stray cats, which were resistant to many drugs, provides an early warning of environmental health. Environmental health is closely related to animal and human health, especially antibiotic resistance.

Background and Aim: The increasing prevalence of resistance (MDR) of Enterobacteriaceae in Indonesia has caused concern regarding human health. Citrobacter freundii reportedly targets the gastrointestinal tract of animals and is a common cause of foodborne diseases associated with diarrhea, peritonitis, meningitis, brain abscess, bacteremia, and urinary tract infection. This study aimed to estimate the prevalence of MDR and the presence of Class 1 integron-encoding genes in C. freundii isolates obtained from cloacal swabs of healthy laying chickens in Blitar district, Indonesia. Materials and Methods: One hundred and sixty-five cloacal swab samples were collected from 33 farms in Blitar over a period of 4 months. Standard microbiological techniques such as bacterial culture in MacConkey agar, Simmons citrate agar, and triple sugar iron agar and biochemical tests such as the indole test were performed to identify the isolates. The antibiotic sensitivity patterns of C. freundii isolates were determined by the disk diffusion method, and MDR-encoding genes (Class 1 integron) were detected by polymerase chain reaction (PCR). Results: Out of 165 cloacal swab samples, 7 (4.24%) were positive for C. freundii. Citrobacter freundii was highly resistant to erythromycin (71.43%) and moderately to streptomycin, tetracycline, and trimethoprim-sulfamethoxazole (all 42.86%); however, it showed low resistance to ampicillin (28.57%). All isolates were found to exhibit MDR. Only 1 (14.29%) of the seven C. freundii isolates harbored a Class 1 integron gene. This study revealed that Class 1 integron-encoding genes have a low prevalence in C. freundii isolated from healthy laying chickens in Blitar, Indonesia. Conclusion: Poultry animals can play a role in the transmission of resistance genes to humans due to the MDR of Enterobacteriaceae, including C. freundii in the intestines.

Escherichia coli producing ESBL in humans, animals and the environment trigger the emergence of antimicrobial resistance. This study analyzes the potential risk factors in commercial chickens as an infectious factor for the ESBL-producing Escherichia coli as an effort to prevent and control the wider spread of Escherichia coli-producing ESBL events. This study was a descriptive analytic epidemiological study with a cross-sectional study design. Sampling using stratified random sampling by taking as many as 5 samples per commercial chicken farm in Blitar District. Data collection is done by direct interviews with farmers based on a questionnaire and field observations and inspection of livestock, supplemented with supporting documentation. Primary data were obtained through a questionnaire and direct observation of the research object to determine risk factors that could affect the Escherichia coli producing ESBL that were resistant to antibiotics in commercial chicken in Blitar District. Escherichia coli is a commensal bacterium that is naturally present in the chicken digestive tract. The existence of the highest ESBL producing Escherichia coli was 45.56% in the type of partnership farming. Risk factors with the highest association strength on risk factors for partnership type (OR = 11.02, CI 95% = 5.84-20.77), the presence of antibiotic administration programs (OR = 6.76, 95% CI = 2.05-22.22), broiler chicken species ( OR = 5.34, 95% CI = 2.76-10.32), and the purpose of using antibiotics as prevention (OR = 3.55, 95% CI = 1.86-6.74). Efforts to prevent and control the ESBL-producing Escherichia coli in commercial poultry can be done by increasing surveillance of antibiotic use, in this regard it is necessary to supervise animal health personnel in the management of livestock raising for the correct use of antibiotics in commercial chicken farms.

A common indicator used to examine the frequency and distribution of antibiotic resistance against other enteric bacteria in humans and animals is the commensal enteric bacterium, Escherichia coli. The transmission of plasmids harboring ESBL enzymes, primarily generated by E. coli, is the cause of this resistance. The purpose of this study was to identify the CTX-M gene in ESBL-producing E. coli from broiler chicken cloacal swabs in traditional Surabaya markets. The samples used were 96 cloacal swabs from broiler chickens in the traditional markets of Dukuh Kupang, Keputran, Pacar Keling, and Pucang. The antibiotic disks used in this study belonged to five different antibiotic classes; they are aztreonam (monobactam), chloramphenicol (phenicol), kanamycin (aminoglycoside), ciprofloxacin (fluoroquinolone), and tetracycline (tetracycline). Presumptive ESBL strains were then molecularly screened for the presence of CTX-M gene. Results revealed that out of the 96 chicken cloacal swab samples collected, 58 (60.42%) were positive for E. coli based on morphological culture, Gram staining, and biochemical tests. Additionally, 15 out of the 58 E. coli isolates recovered from broiler chicken cloacal swabs were multidrug-resistant (MDR) while 7 of E. coli isolates harbored CTX-M gene. Conclusively, this study has shown that broiler chickens sold in traditional Surabaya markets harbor MDR E. coli which possess CTX-M gene. Conditions in traditional markets with low levels of cleanliness and chickens placed close together can spread resistance genes with serious public health consequences. Therefore, it is imperative to observe good hygienic practices in Surabaya traditional markets in order to curtail the spread of MDR bacterial pathogens in the food chain.