Table. Number of survey respondents reporting difficulty in distinguishing between foodborne disease outbreaks and outbreaks caused by other modes of transmission in the National Outbreak Reporting System, United States, 2013.

Mode of transmission	No. (%) respondents
	Experienced difficulty in distinguishing outbreak type	If experienced difficulty, likely reported as foodborne to previous system
Foodborne vs. person-to-person, n = 25	20 (80)	15 (75)
Foodborne vs. indeterminate/other/unknown, n = 25	19 (76)	13 (68)
Foodborne vs. environmental contamination, n = 22	11 (50)	8 (73)
Foodborne vs. water, n = 23	8 (35)	2 (25)
Foodborne vs. animal contact, n = 21	6 (29)	1 (17)