The allegations about organisms in the sterile salt water come from a clip on youtube where three anonymous people sit at a kitchen table and look under a microscope.

The region's supplier of the test, Eurofins, has in recent weeks been contacted by a worried parent per day who wonders what it is in the sterile saline solution.

- We took it seriously and sent our product for microscopy and culture to our lab in Uppsala.

We found nothing there, says Henrik Jonsson, incoming CEO of Eurofins clinical testing AB.

Has also been sent to Finland

Eurofins has started a case with the Medical Products Agency.

Samples were also sent to a lab in Finland.

Answers from there are expected before Christmas.

- These tests have been used for several weeks without us receiving any indication that something was wrong.

I would be very surprised if you find something in the Finnish lab.

What do you want to say to worried parents?

- You should not be worried at all.

This kit has been used by thousands of people.

Had it not been sterile, something would have grown on our own samples as well.

The Medical Products Agency: "Contact your healthcare provider or the lab in your region"

Helena Henriksson is group manager at the unit for medical technology at the Medical Products Agency.

She states that there have been some questions based on the clip that is spread online.

But she sees no reason to worry and says that it is possible to question the investigation that is done in the clip.

- It is not done in a lab but looks like it is in someone's kitchen, which is a non-sterile environment.

It is also not seen that the preparation of the sample that is microscopied takes place according to the routines used by the profession, she says.

The gargle tests are made in China.

They are CE marked in accordance with EU directives and the Medical Products Agency's regulations for medical devices.

This means that they must meet European safety and performance requirements that apply to the European market, regardless of where the manufacturer is located.