• S S Hassan, Å Seigerud, R Abdirahman, L S Arroyo Mühr, S Nordqvist Kleppe, E Pin, A Månberg, S Hober, P Nilsson, L Engstrand, Miriam ElfströmKKKarolinska University Hospital, Stockholm, Sweden., J Blomqvist, K Conneryd Lundgren, and J Dillner.
• From the, Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden.
• J. Intern. Med. 2021 Aug 1; 290 (2): 430-436.

BackgroundIn Sweden, home care services is a major external contact for older persons.MethodsFive home care service companies in Stockholm, Sweden, enrolled 405 employees to a study including serum IgG to SARS-CoV-2 and SARS-CoV-2 virus in throat swabs.Results20.1% (81/403) of employees were seropositive, about twice as many as in a simultaneously enrolled reference population (healthcare workers entirely without patient contact, n = 3671; 9.7% seropositivity). 13/379 employees (3.4%) had a current infection (PCR positivity). Amongst these, 5 were also seropositive and 3 were positive with low amounts of virus. High amounts of virus and no antibodies (a characteristic for presymptomatic COVID-19) were present in 5 employees (1.3%).ConclusionsPersonnel providing home services for older persons appear to be a risk group for SARS-CoV-2. Likely presymptomatic employees can be readily identified by screening. Increased protection of employees and of the older persons they serve is warranted.© 2021 The Association for the Publication of the Journal of Internal Medicine.

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