The quarantine authorities are nervous as the so-called 'deltacron' mutation, which is a mixture of the corona 19 delta mutation and omicron mutation, was discovered in Europe and the United States.

It's true that the name alone sounds like a scary virus with both the lethality of the delta mutation and the explosive contagiousness of the omicron mutation, but experts believe the new mutation is unlikely to cause major problems, The New York Times reported.

DeltaCron was first reported in the eastern Mediterranean island country of Cyprus in January, but it turned out to be an error due to incorrect laboratory work.

Then, in February, scientist Scott Nguyen of the Institute of Public Health in Washington, DC, looked at the International Influenza Information Sharing Organization's coronavirus genome database, and first confirmed that a sample collected in France in January had a mix of delta and omicron mutations.

It was also claimed that the samples were from patients co-infected with two mutations, but it was confirmed that each virus had a combination of genes from two mutations.

Scientists call these viruses 'recombinant'.

This recombination pattern with deltas and omicrons was also found in the Netherlands and Denmark.

Currently, the number of deltaclones samples reported to the International Virus Sequence Database are 33 in France, 8 in Denmark, 1 in Germany and 1 in the Netherlands.

Gene sequencing company Helix has also discovered two delta clones in the United States, Reuters reported recently.

But despite its name, Delta Cron, experts say, has many reasons not to be afraid.

"It's not a new concern," said Etienne Simone-Laurier, a virologist at the Pasteur Institute in France, noting that deltacrone is an extremely rare virus.

It's been there since at least January, but it still hasn't shown the ability to spread exponentially.

Since most of the spike protein genes of this virus are derived from omicrons, it was also explained that people who had antibodies to omicron mutations through infection or vaccine also had the ability to protect against deltaclones.

In addition, experts believe that DeltaCron also has the characteristic of Omicron's spike protein, which is less likely to lead to severe disease.

Omicron's spike protein can easily penetrate the nose and upper respiratory tract, but it does not penetrate deep into the lungs.