Viral nervous necrosis (VNN) has been reported to infect larvae and juvenile of humpback grouper, and until now, this virus is one of main problem for humpback grouper. Co-agglutination test proved to be a simple, rapid and reliable diagnostic test suitable for use in the field or laboratory without any special apparatus. The study aimed to study application of a co-agglutination test using Staphylococci sensitized with specific antibody for the diagnostic of VNN in grouper. First, brain and eye organ samples from diseased fish are homogenized with phosphate buffer saline (PBS) of pH 7.2. Then, the supernatant is collected after centrifugation at 8,000 rpm for 20 min, and finally one drop of the supernatant and one drop of anti VNN antibody sensitized Staphylococci suspension are mixed on a glass slid and observation of the agglutination is performed after 5-10 min. The result shows that co-agglutination technique detects positive VNN in the brain and eye samples. The co-agglutination technique may provide valid result in a very short time as compared with complex method, such as enzyme-linked immunosorbant essay (ELISA) and fluorescient antibody technique (FAT) that require a high cost. Thus, this test can detect VNN faster, simple and more economic.
For the past few years, Edwardsiella tarda has become major problem in African catfish culture in Jambi. Detection by biochemical characteristic can lead to inaccurate result and there is a necessity to develop more specific and accurate method, one of which is Agar Gel Precipitation (AGP) method. Six samples each were collected from two African catfish farm located in District Sungai Gelam and Telanai Pura in Jambi, which was showed clinical signs of E. tarda outbreak with more than fifty percent mortality rate. Heat stable soluble antigen was prepared from 2 groups of pure culture isolated from sample for AGP test. Antiserum for test wells was antiserum of E. tarda (ATCC 15947) that have been produced by inoculating whole-cell antigen (heat-stable) and flagellar antigen (formalin-killed) in rabbit. For control positive, soluble antigen prepared from E. tarda (ATCC 15947), and control negative from Aeromonas hydophila (ATCC 35654) and Edwardsiella ictaluri (NCIMB 13272). Both antiserums were able to show positive reaction visible by the formation of specific precipitin lines between antiserum and antigen wells, and there was no precipitin reaction for negative control. In conclusion AGP method is a one of reliable technique to identify E. tarda.
Teknik immunodiagnostik dengan menggunakan uji serologis co-agglutination telah lama dikenal dalam mendeteksi infeksi bakteri dan virus pada manusia, hewan, ikan, dan cemaran pada produk-produk perikanan. Keunggulan teknik ini adalah sederhana, cepat, murah, dan akurat, terutama untuk penerapan di lapangan karena dapat mendeteksi langsung dari organ. Namun penggunaan metode kurang dikenal dibandingkan metode lain yang lebih kompleks dan mahal seperti ELISA dan FAT. Pengembangan metode ini di Indonesia telah dilakukan sejak tahun 2014 dan telah diaplikasikan di lapangan dengan hasil yang memuaskan, terutama dalam mendeteksibakteri Edwardsiella ictaluri penyebab penyakit Edwardsiella Septicemia of Catfish pada ikan patin (Pengasius hypophtalmus) dan lele (Clarias garipienus) di Jambi. Pengambilan sampel dilakukan di 70 lokasi sentra budidaya ikan patin dan lele di 4 kabupaten, di Provinsi Jambi selama bulan April-Juni 2015. Pengujian dengan teknik co-agglutination mendeteksi 5 lokasi budidaya positif tersebut E. ictaluri. Organ yang diuji dengan teknik ini diisolasi ke media agar untuk diuji secara konvensional dan serologis dengan metode rapid slide aglutination dan terkonfirmasi positif. Isolat yang diperoleh juga diujibandingkan ke laboratorium yang telah terakreditasi dalam ruang lingkup E. ictaluri di Batam dan Tanjung Pinang, dan mendapatkan hasil positif. Uji lapangan inimembuktikan bahwa teknik co-agglutination dapat memberikan hasil yang valid dalam waktu beberapa jam saja dibandingkan dengan metode konvensional yang memakan waktu berhari-hari, ataupun dengan metode ELISA dan FAT yang membutuhkan biaya tinggi. Inovasi teknologi dengan metode ini dapat menjadi jawaban atas tantangan globalisasi terutama dengan diberlakukannya kawasan Masyarakat Ekonomi Asean, dimana lalulintas peredaran ikan dan pengembangan industri perikanan makin meluas yang membawa resiko merebaknya wabahpenyakit ikan.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.