Outbreak of Shigellosis likely associated with a Conference at a Hotel Venue in Downtown Los Angeles, August 21-24, 2023

Alameda County Public Health Department, in coordination with the California Department of Public Health (CDPH), is investigating an outbreak of shigellosis likely associated with a union delegate conference held at a hotel venue in downtown Los Angeles from August 21-24, 2023. The event included an estimated 300+ attendees from across California. As of August 31, 2023, CDPH is reporting six shigellosis cases from four California local health jurisdictions among event attendees, including Alameda County residents. At least three/six cases were PCR+ for Shigella; culture and additional subtyping are pending. Known illness onset dates were on 8/25/23; at least two patients have been hospitalized. As of September 1, 2023, Alameda County is reporting three shigellosis cases to CDPH, all of whom attended this event.

To report cases to Alameda County Public Health Department, complete and indicate on the CMR report “LAC Conference Outbreak”. Fax the completed CMR to (510)273-3744 or email acutecd@acgov.org.

Please see the Health Advisory for detailed information.