The present study was conducted with the following aims: (i) To detect the multidrug-resistant Salmonella spp. isolates recovered from faeces, litter and drinking water in layers and broiler breeders' farms and (ii) to carried out the detection of the tet gene. A total of 21 Salmonella isolates were subjected to Polymerase Chain Reaction (PCR) assay to determine the presence of tet gene. Out of 21 isolates, 14 (66.7%) and 7 (33.3%) were found positive for tet(A) and tet(B), respectively. In antimicrobial susceptibility tests, the Salmonella isolates showed resistance to tetracycline, oxytetracycline, ampicillin, nalidixic acid, enrofloxacin, gentamicin and chloramphenicol. It can be concluded that the high prevalence of the tet gene indicates a high potential of Salmonella isolates for horizontal transmission of tetracycline resistance genes.
Penelitian ini bertujuan untuk mengidentifikasi gen penyandi resistansi dan plasmid yang memperantarai resistansi terhadap kuinolon pada Salmonella spp.,. dari peternakan ayam di Bandung dan Purwakarta, Jawa Barat. Total sampel ada 70 sampel yang dikoleksi dari peternakan ayam di Bandung dan Purwakarta. Semua isolat diuji dengan media selektif Salmonella Shigella Agar (SSA) dan dikonfirmasi menggunakan Polymerase Chain Reaction. Sebanyak 33 isolat positif berdasarkan hasil isolasi dengan media selektif dan uji biokimia. Uji konfirmasi dilakukan dengan PCR yaitu dengan menggunakan gen InvA. Sebanyak 21 dari 33 isolat positif terdapat gen invA. Sebanyak 21 isolat diuji resistansi antibiotik terhadap tetrasiklin, doksisiklin, asam nalidiksat, oksitetrasiklin, dan enrofloksasin menggunakan metode disk diffusion. Tetrasiklin yang resistan diuji untuk mengetahui keberadaan gen tet(A) dan tet(B) dengan menggunakan single PCR. Plasmid-Mediated Quinolone Resistant diuji untuk mengetahui keberadaan qnr(A), qnr(B) dan qnr(S) dengan multiplex PCR. Tetrasiklin 100%, oksitetrasiklin dan ampisilin 95,2%, Asam nalidiksat 90,4%, eritromisin 85,7%, enrofloksasin 76,2%, gentamisin 47,6%, kloramfenikol 38,1%. Adapun gen penyandi resistansi pada isolat Salmonella spp., yang berhasil dideteksi, di antaranya ampC (95,2%), tet(A) 61,9%, tet(B) 38,1%, qnr(A) 28,5%, qnr(B) 14,3%, qnr(S) 23,8%, qnr(A) dan qnr(B) 14,3%, qnr(A) dan qnr(S) 9,5%. Penelitian ini menunjukkan beberapa patogen telah resistan terhadap ampisilin, tetrasiklin dan kuinolon. Gen tet dan qnr bertanggung jawab terhadap tingginya resistansi pada Salmonella spp., di Bandung dan Purwakarta Jawa Barat.
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