unknown, dr. anthony fauci urged americans not to get complacent. >> we've really got to be careful before we make any determinations that it is less severe or really doesn't cause any severe illness comparable to delta. >> reporter: the new variant has now been detected in at least 18 states including louisiana where 17 n covid s were discoveren a norwegian cruiseline ship that just returned to port sunday. all crew was required to have vaccinated. a south african crew member was thought to have the omicron variant. is there any data to show how effective our current vaccines are when it comes to omicron. >> all vaccines have shown some degree of cross protection in terms of virus neutralizing antibodies so i suspect the same will be true of omicron. >> reporter: dr. peter hotez says vaccination remains the best protection.