Table 3.

COVID-19 clusters in Nursery schools and schools in Japan, from January 15 to October 31, 2020.

Type of facility	Month	Number of cases		Pediatric and adolescent primary case in the cluster	Days between the first and last case identification in the cluster
		Total cases	Pediatric and adolescent cases (%)
Nursery school A	April	7	2 (29%)	No	6 days
Nursery school B	April	13	2 (15%)	No	5 days
Nursery school C	August	7	5 (71%)	Yes	9 days
Nursery school D	August	8	6 (75%)	No	3 days
Nursery school E	August	8	6 (75%)	No	7 days
Nursery school F	August	11	4 (36%)	No	3 days
Nursery school G	August	15	8 (53%)	No	3 days
Nursery school H	September	29	12 (41%)	No	17 days
Primary school A	September	5	5 (100%)	Yes	5 days
Primary school B	September	23	20 (87%)	Yes	2 days
Primary school C	October	6	2 (33%)	No	5 days
Junior high A	July	5	5 (100%)	Yes	8 days
Junior high B	July	24	12 (50%)	No	4 days
Junior high C	October	9	6 (67%)	No	10 days
High school A	August	24	23 (96%)	Yes	6 days
High school B	August	6	6 (100%)	Yes	1 day
High school C	August	15	12 (80%)	No	5 days
High school D	August	101	11 (11%)	Yes	6 days
High school E	September	36	35 (97%)	Yes	9 days
High school F	September	8	8 (100%)	Yes	7 days
High school G	October	11	9 (82%)	Yes	3 days
Professional training college A	July	16	9 (56%)	No	4 days
Professional training college B	July	5	4 (80%)	Yes	3 days
University A	July	26	18 (69%)	No	9 days
University B	August	60	21 (35%)	No	11 days
University C	August	7	3(43%)	No	1 days
University D	August	11	3 (27%)	Yes	2 days
University E	October	12	12 (100%)	Yes	8 days

Numbers of cases (%) were indicated.