The delta variant, the virus variant first discovered in India, is a more contagious variant of the coronavirus.

Compared to the alpha variant, the virus variant that was first discovered in the UK, it can be fifty percent more contagious, according to, among others, Jan Albert, professor of microbiology and infection control expert at Karolinska Institutet.

In the Stockholm region and the Kronoberg region, just over one in three has now been infected with the delta variant.

In Västmanland, the delta variant makes up four out of ten infected and in Blekinge and Uppsala, every other case is now the delta variant.

In Värmland, which had an early spread of delta, this variant is now completely dominant with 90 percent of all cases. 

- It is clear that it will be a very worrying situation.

It places great demands on personal responsibility.

We must be very vigilant and be well prepared to implement targeted measures if necessary, says Anna Skogstam, infection control doctor in Värmland.

Risk of spread among single-dose vaccinated

SVT has been in contact with infection control units in all of Sweden's 21 regions and they basically all agree that the delta variant will be the dominant variant.

And it could have an effect on the spread of infection as a whole.

That is the opinion of Bengt Wittesjö, who is an infection control doctor in Blekinge.

- There is a slightly worse effect on the immune system after just one dose.

As we are not in phase with the vaccinations and the spread of the delta variant.

Then the risk is that we can get a spread even among those who are vaccinated with a dose only, says Bengt Wittesjö.

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"You can see that this variant becomes dominant very quickly," says Emma Frans in SVT's Morgonstudio. Photo: SVT