Estudo do rendimento viral na produção da vacina influenza, com base no uso de ovos de galinha embrionados com diferentes idades

Abstract

This experimental study proposes to carry out a data collection regarding the viral yield of the production of the monovalent influenza virus, using embryonated chicken eggs with different ages. Considering that it is an experimental work, the main justification for its realization is the constant search for the improvement of industrial production processes, specifically, the possibility of increasing the production capacity of the factory of monovalent influenza viruses. For this, the determination of the best embryonic age will enhance a greater replication of the viral population existing in the microenvironment of the egg surrounding the embryo. All stages of the study procedures, which included the use of various modern equipment and laboratory materials, as well as specific reagents inherent to the process, were in accordance with the parameters established by the Quality Assurance department of the Butantan Institute, being in-process controls essential for the different stages of the artificial incubation stage of embryonated chicken eggs. Embryonated chicken eggs aged between 37 and 44 weeks, strains B/Phuket/3073/2013, B/Austria/1359417/2021, A/Darwin/9/2021, respectively, were used, totaling 9,000 (nine thousand) eggs with 9 (nine), 10 (ten), 11 (eleven) and 12 (twelve) day-old embryos for interpretation of the respective statistical data. The study was carried out in the Laboratory for the Production of Influenza Banks (PBI) building, since it was in compliance with regard to the nature of the laboratory activities monitored by the Institution's support disciplines, as well as being in line with the Good Laboratory Practices, Good Manufacturing Practices and Good Biosafety Practices. The eggs were incubated in specific artificial incubation machines and subjected to a temperature range between 33°C and 35°C, as well as a humidity of approximately 55%, which were the in-process controls chosen for effective viral replication and subjected to following unit operations: receipt of eggs, primary candling, primary incubation, preparation of viral inoculum, test of hemagglutinating units of viral inoculum, viral inoculation, secondary incubation, secondary candling, primary cooling, collection of Allantoic Liquid, secondary cooling, sample purification , determination of sucrose content, UHA and Optical Density of

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purified samples. The results of this experimental study were submitted to statistical analysis to enhance discussions about the implementation of the use of embryonated chicken eggs, with 11 days and/or 12 days of life, better viral yields found, as strategies to establish new specifications of embryonated eggs, as raw material for the production process.