Table 1.

Total specimens for laboratory test during the outbreak investigation

Sampling subjects	No. of specimens	Sampling date	No. of positive specimens
Cases	12	November 22nd	2
	5	November 24th	1
	4	November 25th	1
	1	November 26th	0
	8	November 28th	2
	3	November 29th	1
	3	November 30th	2
	2	December 3rd	2
Asymptomatic food handlers*	10	November 22nd	4
	40	November 23rd	5
Environment surfaces	153	November 22nd	8
Drinking water	2	November 22nd	0
Food samples	10	November 22nd	0

*The repeated tests of food handlers were not included.