The WHO said in travel advice Tuesday on the Omicron coronavirus variant that people vulnerable to developing severe Covid-19 disease, including the over-60s, should be advised to postpone travel.

"Persons who are unwell or at risk of developing severe Covid-19 disease and dying, including people 60 years of age or older or those with co-morbidities (e.g. heart disease, cancer and diabetes), should be advised to postpone travel," the WHO said in a travel advice statement on Omicron.