several developments on the mystery still surrounding the omicron coronavirus variant. at least 19 countries now have confirmed cases of the variant, which has spread to five continents. this morning japan is taking a major step after reporting its first case, shutting down its borders to all foreign travelers. the south african doctor who was one of the first treat patients sick with this new variant calls travel bans an overreaction, especially since there is so much we still don't know. listen. >> i think it was an overreaction. i do understand that there's a lot of mutations in this virus. i do understand that it might be much more far spreading than the delta variant. people say yes, but i'm trying to protect my people. so then the question would be how doon it's not in your country yet? how do you know that a lot of those infections that you are