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Actual surveys in kindergartens on SARS-CoV-2 infections are rare. At the beginning of the second pandemic wave, we screened twelve randomly selected kindergartens in Berlin, Germany. A total of 720 participants (pre-school children, staff, and connected household members) were briefly examined and interviewed, and SARS-CoV-2 infections and anti-SARS-Cov-2 IgG antibodies were assessed. About a quarter of the participants showed common cold-resembling symptoms. However, no SARS-CoV-2 infection was detected, and only one childcare worker showed IgG seroreactivity. Against a backdrop of increased pandemic activity in the community, this cross-sectional study does not suggest that kindergartens are silent transmission reservoirs.

Studies were undertaken to characterize the pattern of proximal tubular fluid (APRHIO) and bicarbonate reabsorption (APRHCO,)

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