Table 4. Characteristics of SARS-CoV-2 cases at follow-up testing after 7 days, Berlin, Germany, 9–25 November 2020 (n = 7).

Index participant’s school type	Index participant or HM	In index participants: case in class?	Linked index participant positive at testing?	Other HM positive?	Infection assumed to be school-related?a	Social stratumb	Ct value	Temperature (≥ 37.5 °C)	Present symptoms during testing	Symptoms after testing	Cumulative number of HM tested positive (n/n tested)c
Primary school	HM	NA	Yes	Yes	Unclear	High	15.8	NA	Headache, limb pain, anosmia, cough	Cough for approx. 14 days	3/4
Primary school	HM	NA	Yes	NA	Unclear	Low	21.0	36.4	None	None	2/2
Primary school	Index participant	No	NA	Yes	No	Low	22.5	36.9	Headache, feeling feverish	Headache, 1 day after test: anosmia, 3 days after: weakness	2/4
Primary school	HM	NA	Yes	Yes	Yes	Low	13.6	36.4	Limb pain, dizziness	2 days after test: anosmia, dizziness, weakness, cough for 1 month	3/4
Secondary school	HM	NA	Yes	NA	Yes	Medium	24.4	36.7	None	None	2/4
Secondary school	Index participant	Nod	NA	No	No	Low	21.8	36.5	Headache, diarrhoea	1 day after: cold, limb pain, diarrhoea, dizziness	2/3
Secondary school	HM	NA	No	No	No	Low	10.7	36.2	Cold symptoms	Strong cold symptoms for a total of 5 days (started 2 days before test)	2/3

Ct: cycle threshold; HM: household member; NA: not applicable; SARS-CoV-2: severe acute respiratory syndrome coronavirus 2.

^a Based on review.

^b Strata ranking is primarily characterised by indicators of unemployment, state transfer payments and corresponding income, as well as health indicators such as premature and avoidable mortality and tobacco-related serious illnesses [16].

^c Including those from cross-sectional testing.

^d No fixed class in this school subcohort; positive staff identified in school at cross-sectional testing; but no contact between those two cases, therefore not regarded as a secondary case.

Age not reported to avoid identifiability of participants.