Frida Karlsson was forced to rest for a week after the stressful Tour de Ski week that ended with a nightmarish climb up Alpe Cermis and a collapse at the finish line.

And then she caught a cold.

- I think that the total load during the Tour de Ski, there are several others from different national teams who have also caught a cold, means that there is a great risk of catching a cold.

It is clear that if you go out completely, you increase the risk of contracting a virus or bacteria.

In general, it is the case that the more strained the immune system is, the greater the risk of getting sick, says the national cross-country skiing team's doctor Rickard Noberius to SVT Sport.

But there is no concern for the rest of the season, and perhaps above all the WC in Planica, Slovenia, in just over a month.

- No, no, no, she has taken a covid test every day and that's not it.

It's a common cold that many others got after the tour too, says Karlsson's coach Per Nilsson to SVT Sport when we reach him after a training session with the German women's national team.

In fact, Karlsson is already starting some lighter training.

- In the best case, she's probably getting started today with some light strength training or running.

Or if she takes another rest day just in case, yesterday she didn't train anyway, but that's not the whole world, says Nilsson.

SEE ALSO: Beautiful pictures of Frida Karlsson - visited young people in the home club (11 Jan)

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Frida Karlsson at a youth competition in Sollefteå