Analysis of antigen conservation and inactivation of gamma-irradiated avian influenza virus subtype H9N2

Salehi, Bahareh and Motamedi-Sedeh, Farahnaz and Madadgar, Omid and Khalili, Iraj and Ghalyan Chi Langroudi, Arash and Unger, Hermann and Wijewardana, Viskam (2018) Analysis of antigen conservation and inactivation of gamma-irradiated avian influenza virus subtype H9N2. Acta Microbiologica et Immunologica Hungarica, 65 (2). pp. 163-171. ISSN 1217-8950

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Abstract

Avian influenza (AI) A subtype H9N2 virus belongs to Orthomyxoviridae family and causes low-pathogenic disease AI. The use of gamma-irradiated viral antigens has been developed in the production of effective vaccines. In this research, LPAIV H9N2 strain, A/Chicken/IRN/Ghazvin/2001, was multiplied on SPF eggs and irradiated by a Nordian gamma cell instrument. Irradiated and non-irradiated AI virus (AIV) samples were titrated by EID50 method and hemagglutinin (HA) antigen was analyzed by HA test as the WHO pattern method. Infectivity of irradiated virus was determined by egg inoculation method during four blind cultures. The results showed that after increasing the dose of gamma radiation, virus titer gradually decreased. D₁₀ value and optimum dose for complete virus inactivation were calculated by dose/response curve, 3.36 and 29.52 kGy, respectively. In addition, HA antigenicity of gamma-irradiated virus samples from 0 to 30 kGy was not changed. The results of safety test for gamma-irradiated AIV samples showed complete inactivation with gamma ray doses 30 and 35 kGy, without any multiplication on eggs after four blind cultures. According to the results of HA antigen assay and safety test, the gamma-irradiated and complete inactivated AIV subtype H9N2 is a good candidate as an inactivated immunogenic agent for poultry vaccination.

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