The first responses to tests by the Public Health Agency show that Stockholm has the largest proportion of antibodies developed: 7.3 percent. This can be compared with a total of 4.2 percent in Skåne and 3.7 percent in Västra Götaland.

Petter Brodin, a physician and researcher in immunology, says the numbers are not that surprising:

- You may think the numbers are low, but I agree with Anders Tegnell's analysis that you need to count backwards. Since the virus gets into the nose it takes 2 to 3 weeks before you have antibodies in your blood.

The analysis Petter Brodin aims at is that the tests were taken earlier in April, and therefore the result can show how it looked in Sweden around week 15 - not now. He also thinks that the tests may not give the whole picture of how many have actually become immune to corona:

- It may be that you have a mild infection and very weak measurable antibodies, but that does not mean that you lack immunity. Thus, you can have some immunity even though the antibody test is negative.

Petter Brodin explains the possible darkness of the antibody test that is not perfect, and that antibodies are not the only protection the body has.

The white blood cells remember the virus and respond quickly to a new infection. It is not visible in the tests, but is an important factor to take into account when analyzing the results.

We still know very little about how long you are immune, but the spread of infection in especially Stockholm still says pretty much about the situation, according to Petter Brodin.

- We have not changed our behaviors in the last month and nothing indicates that the virus is changing very much, but we still see a much slower spread, he says and continues:

- For me it must mean that there is a degree of immunity in the population.

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