In the first phase, 200 people who worked at about ten different elderly homes around Stockholm were sampled. Of these, 15 percent had antibodies to the coronavirus, suggesting that they were ill in covid-19.

- Some of the tested people did not have symptoms that would indicate that they had covid -19, says Stefan Amér, unit manager and physician at the Family Physicians. Hear more in the video above.

The family doctors are in charge of the doctor's contact at almost half of the Stockholm area's elderly housing. Of these, half confirmed coronary cases, of which nine people had antibodies but did not recognize any symptoms.

"It's alarming," says Aviva Kraitsik, chief operating officer at one of Stockholm's elderly homes.

Hear more in the video below.

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