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The Dutch public health institute said in a statement that testing was continuing on the samples of 61 people who tested positive for COVID after arriving from South Africa.
The cases emerged among 61 people who tested positive for COVID after arriving in Amsterdam on a flight from South Africa
The Dutch public health authority said on Sunday that 13 people in the Netherlands have so far tested positive for the new coronavirus variant.
The detection comes as the Netherlands moved into a tighter lockdown announced last week. Bars, restaurants and nonessential stores, cinemas and theaters would be forced to shut from 5 p.m. to 5 a.m.
The people who tested positive are being kept in isolation at a hotel near the airport.
"In our (virus) sequencing investigation, which is still ongoing, we have so far found 13 cases of the Omicron variant among the positive (passenger COVID-19) tests," the National Institute for Health (RIVM) said in a statement.
The new COVID-19 restrictions came into force after a partial lockdown had no effect in reducing a spike in cases across the Netherlands.
Dutch hospitals warned that intensive care units could be full up by the end of the week. They have cancelled nonessential sugery to free up beds for coronavirus patients.
Authorities indicated they could even step up lockdown measures in the weeks before the Christmas festive season.
Earlier on Sunday, police in the city of Nijmegen arrested or turned away protesters planning to march against the COVID-19 restrictions, a week after a similar Rotterdam demonstration turned violent.
Dutch Health Minister Hugo de Jonge made an "urgent request" to people returning from southern Africa to get tested "as soon as possible."
"It is not unthinkable that there are more cases in the Netherlands," De Jonge told reporters."We are concerned."
"What is important now is that we keep our finger on the pulse and keep up with the sequencing," he added.
The Netherlands joins a growing list of countries that have begun detecting cases of the newly identified variant.
First detected in southern Africa, omicron cases have now been found in Germany, the UK, Italy, Belgium, Denmark, Hong Kong and Australia.
Omicron is causing alarm as it appears to be much more infectious than the Delta variant and it is not yet known how effective vaccines will be against it.
Researchers have expressed particular concern over the new variant because it shows an extremely high number of mutations of the coronavirus. They have found 32 mutations in the spike protein. By comparison, Delta, which is considered highly infectious, shows eight mutations.
European Commission President Ursula von der Leyen said Sunday the world was in a "race against time" to understand the new variant and, if required, modify vaccines to counter against the threat posed by omicron.
"The scientists and manufacturers need two to three weeks to have a full picture about the quality of the mutations of this Omicron variant," she said.
"We need to buy time," she said, urging people to vaccinate, wear masks and practice social distancing.
Von der Leyen also said that a contract struck in the summer by the EU with BioNTech-Pfizer for 1.8 billion vaccine doses included a clause in case of a strain that can evade vaccine immunity.
The clause states "that if a variant turns into an escape variant... BioNTech-Pfizer is able to adapt its vaccine within 100 days," Von der Leyen confirmed.
jsi, jc/wmr (AP, Reuters, AFP)