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The DISEASE CONTROL BRANCH is committed to the protection of public health through early detection, intervention and treatment of communicable diseases!

The Disease Control Branch provides a variety of services to the individual and the community: preventive care (TB screening); treatment of acute problems (tuberculosis); and investigations to prevent the spread of certain communicable diseases.

The Communicable Disease Program provides investigation, consultation and information on contagious diseases, including water and food borne outbreaks. The program provides referrals for post-exposure treatment for individuals exposed to a communicable disease, if indicated.

Contact the Communicable Disease Program at: (951) 358-5107

Disease Watch

Disease Watch

Flu 2022-23 Surveillance Report - June 23, 2022

21/22 YTD
Human cases: 5
WNV associated deaths: 0
Human cases 10
WNV associated deaths: 0

Human cases: 1

21/22 Flu (0-64 years) YTD
ICU Cases: 0
Flu associated deaths: 0
ICU cases: 4
Flu-associated deaths: 0

Drug Resistant Organisms

Frequently Asked Questions – C. diff (Clostridium difficile)

Frequently Asked Questions - Catheter-Associated Bloodstream Infection (also known as CLABSI)

Frequently Asked Questions – MRSA (Methicillin-resistant Staphylococcus aureus)

Frequently Asked Questions – Surgical Site Infections (SSI)


2020:  14
2021 (YTD): 20 cases

MIS-C in California

West Nile Virus: 10

Human cases: 0

Zika: 1


ICU cases (0-64 yrs): 4

Flu associated deaths: 0 

Covid-19 Confidential Morbidity Report

Health Alert: 

Monkeypox - FAQ English/Spanish

Travel Alerts

Vaping (Updated: 02.20.20)

VAPI cases: 12

Vaping (poster for clinical settings) 
CDPH: Weekly VAPI (EVALI) report

Influenza - 10/1/2019-4/30/2020 (Updated 08.04.20)

ICU cases: 88

Flu -associated deaths: 8

Flu 2019-20 Surveillance Report

Flu 2018-19 Surveillance Report

West Nile: 

May, 2019-2020 (Updated: 02.20.20)

Human cases: 14

WNV associated deaths: 0

West Nile Virus--2018/April, 2019

Human cases: 15 (Updated 1.11.19)

Human cases: 2017: 33 (Updated 01.16.18)

2016: 10 Deaths: 0
(Updated 1/6/17)
2015: 138* Deaths: 6**
Riverside County Public Health Officer Dr. Cameron Kaiser discusses the West Nile Virus (Video)
West Nile GIS map at:

Measles (Updated: 04.29.19)

Local cases: 0

Measles FAQs Eng/Spa

Measles -- Travel

Measles -- Outbreaks in US


Flu 2018-19 (Updated: 04.29.19)

ICU cases: 71

Influenza-associated deaths: 9

Food Safety Alert from the CDC

Valley Fever

Valley Fever in CA

Valley Fever report (2019)  - CDPH

Zika: 2018-2019

Travel associated: 1

(Updated: 1.11.19)

CDPH Zika-Health Information
Zika FAQ English/Spanish

Pregnant Women Urged to Avoid Zika Areas

Getting ready to travel? Check out these health notices 

*Probable and Confirmed Cases.

**Includes deaths in which the patient had the illness but it could not be determined West Nile was the cause of death.

Older items have been moved to the Archive page.


Updated 9/16/19



Department of Public Health
Disease Control Branch
Health Administration Building
4065 County Circle Drive, Riverside, CA 92503
(951) 358-5107 | FAX 358-5446 | TDD 358-5124 | Email: