Abstract
The World Health Organization classified Omicron and Delta variants as “variants of concern” because these variants stand as a warning that the epidemic is far from ended. Because of the pandemic’s vast population size, long incubation period, and the diversity of environment, novel variants have been introduced into SARS-CoV-2 genome all over the world. The ability of virus to develop under selection pressure is aided by protective immune system of the host body. The environment of host body shapes its genetic fitness, dispersion, and evolution. Emerging viruses have used recombination and reassortment to create novel antigenic combinations that may enhance the process of cross-species dispersion. The tracking of SARS-CoV-2 genetic variants over time may aid in our knowledge of viral evolution, behavior, and infection trajectory.
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