World Health Organisation

Health officials around the world are investigating a mysterious increase in cases of the liver condition which was first spotted in the UK.

A common virus called adenovirus, which has rebounded after the pandemic, could be causing the surge.

One death has been reported by the WHO.

As of 1 May, it said most cases of young children with hepatitis had been detected in Europe with small numbers also reported in the Americas, western Pacific and South East Asia.

WHO's South Pacific representative Dr Mark Jacobs said the plan will help countries to move on from the emergency phase of Covid-19, to a phase of managing it "like an ongoing issue".

"In the Pacific, it's been about working with countries, and along with partners, to help build their capacity to manage Covid into the future," he said.

The plan talks about three different possible scenarios, one of those being the virus continues to evolve into new variants.

"The severity of it will go down over time, as immunity increases because of vaccination," Dr Jacobs said.

The move comes more than two years into the pandemic, and just days after free testing ended in England.

However, the NHS cautions that many of the new symptoms "are very similar" to those for colds and flu.

The original signs of a Covid infection that were recognised in the UK were:

Recent studies suggest that Omicron is less likely to make people seriously ill than previous Covid variants.

But the record number of people catching it has left health systems under severe pressure, said WHO chief Dr Tedros Adhanom Ghebreyesus.

On Monday, the US recorded more than one million Covid cases in 24 hours.

The WHO - the UN's health agency - said the number of global cases has increased by 71% in the last week, and in the Americas by 100%. It said that among severe cases worldwide, 90% were unvaccinated.

Dr Tedros Adhanom Ghebreyesu warned against "narrow nationalism and vaccine hoarding" in a new year statement.

His comments come two years since the WHO was first notified of cases of an unknown pneumonia strain in China.

Global Covid cases now stand at 287m, while nearly 5.5m people have died.

Across the world people are marking the new year but celebrations are muted, with many countries wanting to discourage crowds gathering.

Cases of the heavily mutated variant have been confirmed in 77 countries.

But WHO chief Tedros Adhanom Ghebreyesus said it was probably in many others that had yet to detect it, and was spreading at an unprecedented rate.

Dr Tedros said he was concerned that Omicron was being underestimated.

"Surely, we have learned by now that we underestimate this virus at our peril. Even if Omicron does cause less severe disease, the sheer number of cases could once again overwhelm unprepared health systems," he said.

As more countries around the world report cases of Omicron, much remains unknown about the new Covid-19 variant.

It is less than two weeks since Omicron was designated a "variant of concern" by the World Health Organisation, after it was first reported by scientists in South Africa.

In its latest travel advisory, the UN agency includes in that category people over 60, and those with conditions such as heart disease, cancer and diabetes.

It also restates its position that blanket travel bans do not prevent the spread of the variant.

South Africa alerted the world about the variant last week.

Many countries then proceeded to impose restrictions on travel from countries in southern Africa.

"Blanket travel bans will not prevent the international spread, and they place a heavy burden on lives and livelihoods," the WHO said in its statement.

The variant could lead to severe consequences in some regions, the WHO said on Monday.

The head of the organisation, Dr Tedros Adhanom Ghebreyesus, renewed a call for a global push to get vaccines to poorer nations.

Covid-19 is "not done with us" yet he warned.

The variant was detected in South Africa earlier this month with initial evidence suggesting it has a higher re-infection risk. South Africa has been praised for its prompt reporting of the variant.

The U.N. health agency recognized the strain, first referred to as lineage B.1.1.529, as a variant of concern.

Health experts are deeply concerned about the transmissibility of the omicron variant given that it has an unusual constellation of mutations and a profile that is different from other variants of concern.