Table 2.

Attack rates of the outbreak across different demographic characteristics

Characteristics	No. of cases	Total	Attack rate (%)
Overall	278	1995	13.9
Sex
Male	125	890	14.0
Female	153	1105	13.8
Occupation
Students in grades 1-6	183	831	22.0
Students in grades 7-9	55	594	9.3
Students in grades 10-12	16	268	6.0
Teachers	18	252	7.1
Cafeteria food handlers	6	50	12.0
Boarding status (only students)
Boarding	223	1373	16.2
Not boarding	31	320	9.7