Older unvaccinated people should delay travel, says WHO, as Omicron restrictions spread

US, Japan and Singapore tighten rules for travellers but WHO says blanket bans' won't contain the new Covid strain

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The World Health Organization has said those not fully vaccinated who are vulnerable to Covid-19, including over-60s, should delay travel to areas with community transmission, as more countries imposed curbs to combat the spread of the new Omicron variant.

The moves came as the WHO said blanket bans" would not contain the strain of the virus which it previously warned presents a very high" risk globally.