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The technique is called serial passage - the Wikipedia article is good on the science but appears to be censored re. use in GoF research on human pathogens. Obviously if the technique has been successfully used to produce a strain of bird flu adapted to ferrets then the possibility exists of using it of using it to produce a bat coronavirus adapted to humans.

Early in the life cycle of the lab leak theory, there was some speculation that this was what had happened, but the furin cleavage site suggests otherwise.