from abroad requires a negative covid test one day before departure, and that includes u.s. citizens. cnn's salma abdelaziz has more. >> the omicron variant has put the world on edge, triggering new travel bans and lockdown measures. more than 35 countries have reported cases of the coronavirus variant. doctors and scientists are racing to gather data to determine if it's more transmissible, causes more severe illness, and whether it could impact the efficacy of vaccines. >> some of the earlier posts that we've had, starting with the province where it was first observed and across the provinces of south africa, we do think that it is quite infectious, quite transmissible. it is something to worry about. certainly, we didn't want to see another variant emerge and spread around the world at this stage of the pandemic. certainly not what we wanted. but we're not entirely surprised. and i think we're much better prepared to handle it. >> reporter: but many countries are taking no chances.
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