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- W2989773624 abstract "Recombinant hemagglutinin-neuraminidase (HN) based subunit vaccine, which is non-infectious and can be produced using insect cell-culture systems, is a potential alternative to conventional live and inactivated Newcastle disease virus (NDV) vaccines. However, process development for manufacture and efficacy assessment of HN subunit vaccines has been hampered by the absence of reference standards, a cornerstone for robust and sensitive quantitative analytical methods. In this work, a downstream purification strategy was developed to obtain NDV HN which was expressed with a hexa-histidine fusion tag (rHN) to facilitate detection using generic antibodies. Highly purified rHN (∼95%) attained after detergent extraction and two-stage ion-exchange-hydroxyapatite column chromatography was subsequently utilized as reference standards for quantitative ELISA development. Recovery of rHN at different stages of purification was monitored. Quantitation of rHN from crude cell lysates was performed for dose-ranging antibody response and protective efficacy studies. A higher dose (1500 ng) of rHN was correlated to a significant reduction in virus shedding and attainment of herd immunity, as indicated by a higher proportion of chickens (92%) with hemagglutination inhibition (HI) antibody titers ≥ log23. The outcome of this study, shows the importance of downstream process development in enabling robust quantitation and efficacy assessment of a recombinant subunit vaccine." @default.
- W2989773624 created "2019-12-05" @default.
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- W2989773624 date "2020-03-01" @default.
- W2989773624 modified "2023-09-27" @default.
- W2989773624 title "Process development for quantitation and vaccine efficacy assessment of recombinant hemagglutinin-neuraminidase" @default.
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- W2989773624 doi "https://doi.org/10.1016/j.procbio.2019.11.018" @default.
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