Antibody conversion rates to SARS-CoV-2 in saliva from children attending summer schools in Barcelona, Spain

Table 1 Characteristics of participants in the summer school longitudinal study. All individuals with at least one saliva sample of sufficient volume available are included

^aMissing age of 9 adults. IQR in parenthesis
^bAdult: Age 15 years or older
^cAverage (median) time in days between initial and final visit was 14 (SD 6.69, IQR 7.0–21.0); 15.69 (SD 6.44, IQR 10–21) if only those with ≥ 6 days between visits are included
^dIn the saliva antibody study cohort, there were 7 children and 3 adults who tested RT-PCR positive. Among them, one child and one adult were single visits. There was one adult who was positive at the first visit and negative at the last visit, and one child who was positive at both visits; therefore there were 11 positive samples. Among the paired samples, there were 8 with a positive RT-PCR at any timepoint (6 children, 2 adults). In the main infection cohort study [25], 12 participants (9 children among them) were positive by RT-PCR at least in one visit, and from 11 of them there was a saliva sample available for serology. 3446 samples were RT-PCR negative, 2 indeterminate, 11 invalid, and 7 non-available. Only 5 adults have had COVID-19 before the study

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