Sains Malaysiana 52(8)(2023): 2163-2173

http://doi.org/10.17576/jsm-2023-5208-01

 

Oil Based Inactivated Vaccine Formulation for Furunculosis (A. salmonicida) and Protective Immune Response of Rainbow Trout and Brown Trout

(Formulasi Vaksin Tidak Diaktifkan Berasaskan Minyak untuk Furunkulosis (A. salmonicida) dan Tindak Balas Imun Pelindung bagi Trout Pelangi dan Trout Perang)

 

MUHAMMAD AKRAM1, MUHAMMAD HAFEEZ-UR-REHMAN1,*, FARZANA ABBAS1, IMRAN ALTAF2, SIDRA KANWAL3, KASHIF ALI4, NABILA GULZAR5, MUHAMMAD AJMAL5, MUHAMMAD ASAD4 & JAVAID IQBAL6

  1University of Veterinary and Animal Sciences, Department of Fisheries and Aquaculture, Lahore, Punjab, Pakistan

2University of Veterinary and Animal Sciences, Department of Microbiology, Lahore, Punjab, Pakistan

3Department of Zoology, University of Okara, Pakistan

4Department of Zoology, Univeristy of Okara

5Department of Dairy Technology, University of Veterinary and Animal Sciences, Lahore, Pakistan

6Institute of Zoology, Bahauddin Zakariya University, Multan

Received: 31 January 2023/Accepted: 26 July 2023

 

Abstract

The development and growth of the fisheries and aquaculture industries are significantly hampered by illnesses. It is critical to combat pathogenic illnesses, especially bacterial ones. Furunculosis in salmon is mostly brought on by Aeromonas salmonicida in rainbow and brown trout. To control this pathogen, vaccines have been identified as a significant tool. In the present study, we have formulated an inactivated vaccine with oil as an adjuvant and estimated its efficacy. The lethal dose of ArS-Pak-19, was calculated and injected intraperitoneally to the fishes. To analyze the infection, samples of kidney, liver, spleen, and blood were collected at specific times. To estimate the immunogenicity of the vaccine, an experiment was designed. One hundred sixty fishes were distributed into 8 tanks including, six experimental groups and two control groups with its replicates, vaccines injected intraperitoneally 1.6 × 107, 1.6 × 108, and 1.6 × 109 and blood samples were taken fortnightly for 56 days to calculate the antibodies titers. After immunization these groups were challenged with Aeromonas salmonicida (ArS-Pak-19) intraperitoneally. At 7th day of post infection, it appeared in the liver, spleen, and kidney. The relative percentage of survival was estimated with control groups at 30 days after challenge. The relative percentage of survival was 80%. The IgM titers were higher at 24 days of post immunization. We also analyzed that antibodies non-specifically bound with the A-layer of Aeromonas salmonicida. The findings of this study offer evidence that vaccinations boost fishes immunity and serve as a roadmap to further vaccination initiatives.

 

Keywords: Antibodies; IgM titres; immunization; pathogen; pathogenicity

 

Abstrak

Pembangunan dan pertumbuhan industri perikanan dan akuakultur terjejas dengan ketara oleh penyakit. Ia adalah penting untuk memerangi penyakit patogen, terutamanya bakteria. Furunkulosis pada salmon kebanyakannya disebabkan oleh Aeromonas salmonicida pada trout pelangi dan coklat perang. Untuk mengawal patogen ini, vaksin telah dikenal pasti sebagai alat penting. Dalam kajian ini, kami telah merumuskan vaksin yang tidak aktif dengan minyak sebagai pembantu dan menganggarkan keberkesanannya. Dos maut ArS-Pak-19 telah dihitung dan disuntik secara intraperitoneum kepada ikan. Untuk menganalisis jangkitan, sampel buah pinggang, hati, limpa dan darah dikumpulkan pada masa tertentu. Untuk menganggarkan keimunogenan vaksin, satu uji kaji telah direka. Satu ratus enam puluh ikan telah diagihkan ke dalam 8 tangki termasuk, enam kumpulan uji kaji dan dua kumpulan kawalan dengan replikasinya, vaksin yang disuntik secara intraperitoneum 1.6 × 107, 1.6 × 108 dan 1.6 × 109 dan sampel darah diambil dua minggu sekali selama 56 hari untuk menghitung titer antibodi. Selepas imunisasi kumpulan ini dicabar dengan Aeromonas salmonicida (ArS-Pak-19) secara intraperitoneum. Pada hari ke-7 selepas jangkitan, ia muncul di hati, limpa dan buah pinggang. Peratusan relatif kemandirian dianggarkan dengan kumpulan kawalan pada 30 hari selepas cabaran. Peratusan relatif kemandirian ialah 80%. Titer IgM lebih tinggi pada 24 hari selepas imunisasi. Kami juga menganalisis bahawa antibodi tidak terikat secara khusus dengan lapisan-A Aeromonas salmonicida. Penemuan kajian ini menawarkan bukti bahawa vaksinasi meningkatkan imuniti ikan dan berfungsi sebagai peta jalan kepada inisiatif vaksinasi selanjutnya.

 

Kata kunci: Antibodi; titer IgM; imunisasi; patogen; sifat patogen

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  *Corresponding author; email: mhafeezurehman@uvas.edu.pk