TABLE 1—

Message Examples by Content Theme: San Diego County, CA; October–December 2017

Theme	Frequency (%)	Example Tweets	Gwet’s Agreement Coefficient
Policy/government	281 (37.8)	California Declares State of Emergency Over Hepatitis Crisis. https://t.co/1XgJQHXmjn. https://t.co/LP1UF4koGE	0.84
Medical information specific to hepatitis A	90 (12.1)	5 things you need to know about Hep A from an infectious disease specialist affiliated w/ Sharp Grossmont Hospital: . . . https://t.co/aQclhqK4gZ	0.85
General medical information	177 (23.8)	W.H.O. Approves a Safe, Inexpensive Typhoid Vaccine\ by DONALD G. McNEIL Jr. via NYT. https://t.co/vfJOKVO22g	0.84
Risk perception of hepatitis A outbreak	111 (14.9)	18 Dead In San Diego County Hepatitis A Outbreak. https://t.co/IDHPufh01l. https://t.co/Qg7sdeuDS5	0.96
Homeless	151 (20.3)	Hepatitis A outbreak among homeless a byproduct of California’s housing crunch. https://t.co/UuQpQMgXgx	0.91
Other	137 (18.4)	That’s like asking if you’d like to have herpes or Hep A, there really isn’t any good choice for a normal life	0.80

Note. Population size was n = 744.