2.2 Temporal and spatial epidemiology
Of all the 17 outbreaks, 6 were reported in June, 3 were reported in
July, 5 were reported in September, 1 was reported in October, and 2
were reported in November. All outbreaks were reported in schools, 8 out
of 17 were reported in primary school, 6 were reported in vocational
education school, 2 were in kindergarten and 1 in middle school
(Table 1 ).