About 65% of Japan's population have received at least one Covid vaccine booster shot, compared to about 33% in the US, based on government data.

More people getting Omicron and recovering, combined with more vaccinations, could be the key to boosting collective defences against almost any form of Covid, some experts have said.

He says the Delta variant has complicated herd immunity calculations, and that the focus should instead be on vaccinating as many people as possible.

But they say there is a difference between anti-vaxxers and those who are merely sceptical about the vaccines.

The more effective the virus becomes at infecting people, the higher the herd immunity threshold becomes.

Muhyiddin Yassin says the country is well on its way to achieving 100% vaccination by the end of October.

Khairy Jamaluddin says 29% of adults have already received both jabs.

PM Scott Morrison sets out a series of targets for the gradual easing of Covid-19 restrictions.

Authors say that their research highlights the need to maintain other anti-Covid measures until everyone is vaccinated.

It has fully vaccinated 54,800 or 80% of the 68,500 adults eligible for the jab.

The UK government concedes that daily infection rates could surge to 100,000 in the weeks ahead, which would put further pressure on hospitals.

Abang Johari Openg says Sarawak is aiming to achieve herd immunity by the end of August.