Karin Tegmark Wisell, Head of the Department of Microbiology at the Public Health Authority, participated in Friday's Aktuellt to answer questions.

She believes that the case of the sick woman is not a big surprise in itself and that it does not change the risk assessment made for any possible spread of infection.

- Those who have been infected or suspected of being infected will be treated with great caution, she says.

The woman who was found infected with coronavirus traveled to Sweden during a period when she was not contagious. The public health authority's assessment is that she did not risk infecting anyone else during her trip to Sweden.

- We make that assessment based on the days that have passed since she became ill in Sweden. Based on the knowledge available for this type of virus, it is a reassuring period of time when she has been in her apartment without any symptoms, said Karin Tegmark Wisell.

Unclear about incubation time

Earlier this week, it was reported that the corona virus can infect during the incubation period of between two to 14 days. The incubation period is the time from the time of infection until the first symptoms manifest in the patient. But this is currently not something the public should worry about, according to Karin Tegmark Wisell.

- There are some loose comments about infectious risk during the incubation period that lack factual evidence. What matters is that you are contagious during the illness and when you are sick, says Karin Tegmark Wisell to SVT News.

She believes that one must of course be humble for the future development of the virus, but that the infection in the case of the Swedish woman should have spread during the journey home is unlikely, according to Karin Tegmark Wisell.

- We know that there have been lots of air travel, where there are confirmed cases of the infection. There are no reports that people have been infected during the trip, says Karin Tegmark Wisell.

- If everyone had been infected before getting sick, there would be more examples, she continues.