An in vitro and in vivo approach for the isolation of Omicron variant from human clinical specimens
Yadav, P. D.; Gupta, N.; Potdar, V.; Mohandas, S.; Sahay, R. R.; Sarkale, P.; Shete, A. M.; Razdan, A.; Patil, D. Y.; Nyayanit, D. A.; Joshi, Y.; Patil, S.; Majumdar, T.; Dighe, H.; Malhotra, B.; Shastri, J.; Abraham, P.
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Due to failure of virus isolation of Omicron variant in Vero CCL-81 from the clinical specimens of COVID-19 cases, we infected Syrian hamsters and then passage into Vero CCL-81 cells. The Omicron sequences were studied to assess if hamster could incorporate any mutation to changes its susceptibility. L212C mutation, Tyrosine 69 deletion, and C25000T nucleotide change in spike gene and absence of V17I mutation in E gene was observed in sequences of hamster passage unlike human clinical specimen and Vero CCL-81 passages. No change was observed in the furin cleavage site in any of the specimen sequence which suggests usefulness of these isolates in future studies.
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