The Omicron coronavirus variant kept spreading around the world on Sunday, with 13 cases found in the Netherlands and two each in Denmark and Australia as more countries imposed travel restriction to try to seal themselves off.
Dutch health authorities said the 13 cases of the variant were found among people on two flights that arrived in Amsterdam from South Africa on Friday.
Authorities had tested all of the more than 600 passengers on those two flights and had found 61 coronavirus cases, going on to test those for the new variant.
"It is not unlikely more cases will appear in the Netherlands," health minister Hugo de Jonge told a news conference in Rotterdam. "This could possibly be the tip of the iceberg."
The discovery of Omicron, dubbed a "variant of concern" last week by the World Health Organisation, has caused worry around the world that it could resist vaccinations and prolong the nearly two-year Covid-19 pandemic.
First discovered in South Africa, it has now been detected in Britain, Germany, Italy, the Netherlands, Denmark, Belgium, Botswana, Israel, Australia and Hong Kong.
Omicron is potentially more contagious than previous variants, although it is unclear whether it causes more or less severe Covid-19 compared to other strains.
Many countries have imposed travel bans or curbs on southern Africa to try to stem the spread. Financial markets dived on Friday as investors worried that the variant could stall a global recovery.
A South African doctor who was one of the first to suspect a different coronavirus strain said on Sunday that symptoms of the Omicron variant were so far mild and could be treated at home.
Angelique Coetzee, chair of the South African Medical Association, told Reuters that on November 18th she noticed seven patients at her clinic who had symptoms different from the dominant Delta variant, albeit "very mild".
In new cases detected on Sunday, Denmark said it had registered two cases in travellers from South Africa, while officials in Australia said two passengers who arrived in Sydney from southern Africa had tested positive for the variant.
Israel and US
In the most far-reaching effort to keep the variant at bay, Israel announced late on Saturday it would ban the entry of all foreigners and reintroduce counter-terrorism phone-tracking technology to contain the spread of the variant.
Prime minister Naftali Bennett said the ban, pending government approval, would last 14 days. Officials hope that within that period there will be more information on how effective vaccines are against Omicron.
The top US infectious disease official, Anthony Fauci, said Americans should be prepared to fight the spread of the new variant, but that it was not yet clear what measure such as mandates or lockdowns would be needed.
He has said the variant is likely already in the country, although no cases have been confirmed.
In Britain, where two linked cases of Omicron identified on Saturday were connected to travel to southern Africa, the government announced measures to try to contain the spread, including stricter testing rules for people arriving in the country and requiring mask wearing in some settings.
British health minister Sajid Javid said on Sunday he expected to receive advice imminently on whether the government can broaden a programme of providing booster shots to fully vaccinated people, to try to weaken the impact of the variant.
Travel bans criticised
Although epidemiologists say travel curbs may be too late to stop Omicron from circulating, many countries - including the United States, Brazil, Canada, European Union nations, Australia, Japan, South Korea and Thailand - have announced bans or restrictions on travel from South Africa and other southern African nations.
More countries imposed such curbs on Sunday, including Indonesia and Saudi Arabia.
The South African government has denounced the travel measures as unfair and potentially harmful to its economy, saying it is being punished for its scientific ability to identify coronavirus variants early.
The WHO regional director for Africa, Matshidiso Moeti, also criticised some of the travel bans targeting African countries as divisive, and urged countries to follow science and international health regulations in their decision-making.
"With the Omicron variant now detected in several regions of the world, putting in place travel bans that target Africa attacks global solidarity," she said in a statement.
"Covid-19 constantly exploits our divisions. We will only get the better of the virus if we work together for solutions."
As long as large portions of the world’s population are unvaccinated... the pandemic will continue to be prolonged
Mexico's deputy health secretary, Hugo Lopez Gatell, said travel restrictions are of little use, calling measures taken by some countries "disproportionate".
Omicron has emerged as many countries in Europe are already battling a surge in Covid-19 infections, with some reintroducing restrictions on social activity to try to stop the spread.
The new variant has also thrown a spotlight on huge disparities in vaccination rates around the globe. Even as many developed countries are giving third-dose boosters, less than seven per cent of people in poorer countries have received their first Covid-19 shot, according to medical and human rights groups.
Seth Berkley, CEO of the GAVI Vaccine Alliance that with the WHO co-leads the COVAX initiative to push for equitable distribution of vaccines, said on Saturday: "As long as large portions of the world’s population are unvaccinated, variants will continue to appear, and the pandemic will continue to be prolonged."