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California Health Alert Network (CAHAN)

The California Health Alert Network (CAHAN) is the official public health alerting and notification program for California, CAHAN is designed for emergency preparedness information sharing, distribution of pertinent public health related events and alerting materials, dissemination of treatment and prevention guidelines, coordinated disease investigation efforts, preparedness planning, and other initiatives that strengthen state and local preparedness. The priority health communication distribution through the health communication system is ranked into four different levels using the below levels of communications based on the noted definitions. 

Enrollment is limited to administration and select staff with emergency preparedness roles in State Agencies, Local He​​alth Jurisdictions and California Department of Public Health (CDPH) licensed Health Care Facilities.  

Please visit th​is link for more information and details on enrolling: CA​HA​N Alert System - FAQs (   ​​​

Level of communication types:

Alert:Conveys the highest level of importance; warrants immediate action or attention. 

Advisory: Provides important information for a specific incident or situation; may not require immediate action. ​

Update: Provides updated information regarding an incident or si​tuation; unlikely to require immediate action along with general information that is not considered to be of an emergent nature. 

Other Health Advisories:
  • All Facilities Letters - ​An All Facilities Letter (AFL) is a communication from the Center for Health Care Quality (CHCQ), Licensing and Certification (L&C) Program to health facilities that are licensed or certified by L&C. The information contained in the AFL may include changes in requirements in healthcare, enforcement, new technologies, scope of practice, or general information that affects the health facility.
  • Healthcare-Associated Infections Program - CDPH health communications sent through the system by the HAI Program. 
  • Centers for Disease Control (CDC)National Health Alert Network (HAN) is CDC’s primary method of sharing cleared information about urgent public health incidents with public information officers; federal, state, territorial, tribal, and local public health practitioners; clinicians; and public health laboratories
  • Policy Alerts​ - CDPH Policy alerts include the latest guidance and policy updates from CDPH, which may include updates to the California state public health officer orders, public health mandates related to COVID-​19, Mpox, and other topics and resources. Fill out the CDPH Pol​icy Alert Registration form to sign up and receive these updates weekly ​​
    • Increased Respiratory Syncytial Virus (RSV)​ Activity in Parts of the Southeastern United States: New Prevention Tools Available to Protect Patients​

      CDC/Health Advisory– September 5, 2023 - The Centers for Disease Control and Prevention (CDC) ​​is issuing this Health Alert Network (HAN) Health Advisory to notify clinicians and caregivers about increases in respiratory syncytial virus (RSV) activity across some parts of the Southeastern United States in recent weeks, suggesting a continued shift toward seasonal RSV trends observed prior to the COVID-19 pandemic. Historically, such regional increases have predicted the beginning of RSV season nationally, with increased RSV activity spreading north and west over the following 2–3 months. RSV can cause severe disease in infants, young children, and older adults. ​

    • Severe Vibrio vulnificus Infections in the United States Associated with Warming Coastal Waters

      CDC/Health Advisory– September 1, 2023 - The Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Advisory to notify healthcare providers, laboratories and public health departments about recent reports of fatal Vibrio vulnificus (V​. vulnificus) ​infections including wound and foodborne infections. Healthcare professionals are urged to consider V. vulnificus ​as a possible cause of infected wounds that were exposed to coastal waters, particularly near the Gulf of Mexico or East Coast, and during periods with warmer coastal sea surface temperatures​. Healthcare providers in California should report cases to their local p​ublic health department. 

    • ​Important Updates on Locally Acquired Malaria Cases Identified in Florida, Texas and Maryland​​

      CDC/Health Update– August 28, 2023 - The Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Update to share new information with clinicians, public health authorities, and the public about locally acquired malaria cases identified in the United States. On August 18, 2023, a single case of locally acquired malaria was reported in Maryland in the National Capital Region. This case was caused by the Plasmodium falciparum (P. falciparum) species and is unrelated to the cases involving local transmission of Plasmodium vivax (P. vivax) malaria in Florida and Texas described in the HAN Health Advisory 494 issued on June 26, 2023. As an update to that report, to date, Florida has identified seven cases and Texas has identified one case of locally acquired P. vivax malaria, but there have been no reports of local transmission of malaria in Florida or Texas since mid-July 2023.​​

    • CDPH/Health Advisory – August 28, 2023 - The ​Sonoma Department of Health Services (SDHS) and California Department of Public Health (CDPH) are investigating an Aeromonas outbreak linked to Tough Mudder adventure race events at the Sonoma Raceway on August 19 and 20, 2023. Numerous race participants have experienced skin and soft tissue infections (SSTIs, ​most frequently described as a pustular rash), along with other symptoms such as fever and headache. Healthcare providers should ask patients presenting with SSTIs about whether they participated in a Tough Mudder race at the Sonoma Raceway and should report cases to their local public health department. 

    • CDPH/Health Advisory – August 15, 2023 - In response to the U.S Food and Safety Administration​ recall announcement, the Centers for Disease Control and Prevention (CDC) and the California Department of Public Health (CDPH) are encouraging healthcare providers to remain vigilant for possible Listeria infections. On August 9, Real Kosher Ice Cream recalled all flavors of their “Soft Serve On The Go” ice cream cups. Recalled ice cream cups were distributed nationwide to multiple long-term care facilities. There has been one sick person in this outbreak that was served this ice cream cup while residing in a long-term care facility. California long term care facilities and healthcare providers should contact their local health department immediately if they identify a case in a resident of a long-term care facility or if there are multiple suspected cases.

    • CDPH/Health Advisory – June 25, 2023 - Since 2010, more than 1,000 cases of silicosis in workers who fabricate countertops have been reported worldwide. Workers in this industry can inhale crystalline silica dust as they cut and finish countertops, which places them at risk for silicosis, a severe, incurable lung disease. In California, more than 70 cases of silicosis and at least 10 deaths have been identified among countertop fabrication workers. Workers with silicosis are characterized as young (median age of 45), immigrant men; many have experienced delayed diagnoses and accelerated disease course. California health care providers should ask patients about their occupation and suspect silicosis in countertop workers. To report cases to CDPH, call 1-800-970-6680 or email

      • CDC​/Health Advisory – June 30​​​​, 2023 –  The Centers for Disease Control and Prevention (CDC) is reminding healthcare professionals seeing patients affected by wildfire smoke to be alert to the possible adverse effects of smoke exposure, particularly among individuals at higher risk of severe outcomes. The acute signs and symptoms of smoke exposure can include head​ache, eye and mucous membrane irritation, dyspnea (trouble breathing), cough, wheezing, chest pain, palpitations and fatigue. Wildfire smoke exposure may exacerbate respiratory, metabolic, and cardiovascular chronic conditions like asthma, chronic obstructive pulmonary disease (COPD) and congestive heart failure​.

    • Locally Acquired Malaria Cases Idenified in the United States

      CDC​/Health Advisory – June 26, 2023 –  The Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Advisory to share information and notify clinicians, public health authorities, and the public about: ​​1. Identification of locally acquired malaria cases (P. vivax) in two U.S. states (Florida [4] and Texas [1]) within the last 2 months. 2. Concern for a potential rise in imported malaria cases associated with increased international travel in summer 2023, and 3. Need to plan for rapid access to IV artesunate, which is the first-line treatment for severe malaria in the United States.​ 

  • Guidance on Measles During Summer Travel Season

    CDC​/Health Advisory – June 22, 2023 –  As the summer travel season begins, the Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Advisory to remind clinicians and public health officials to provide guidance for measles prevention to international travelers and to be on alert for cases of measles. The United States has seen an increase in measles cases during the first 5 months of 2023, with 16 reported cases compared with 3 in 2022 during the same period. Most of these cases were among children who had not received measles-mumps-rubella (MMR) vaccine. To prevent measles infection and spread from importation, all U.S. residents should be up to date on their MMR vaccinations, especially prior to international travel regardless of the destination. ​

  • Request to Submit Specimens from Patients Receiving Intensive Care for Influenza A to Public Health Laboratories

    CDPH/Health Update – June 21, 2023 –  In response to the global outbreak in birds of highly pathogenic avian influenza (HPAI) A(H5N1), the Centers for Disease Control and Prevention (CDC) and the California Department of Public Health (CDPH) are encouraging providers to remain vigilant and to test for influenza among persons with severe respiratory illnesses or who are exposed to poultry and swine​​​. California healthcare providers are requested to submit influenza positive A samples in several specific clinical scenarios described in the Health Update to local health department laboratories for influenzas A subtyping.​ ​

  • Xylazine in Illicit Fentanyl in the United States

    CDPH/Health​​​​​ Advisory - June 15, 2023 - ​​On April 12, the White House officially designated fentanyl adulterated or associated with xylazine as an emerging threat to the U.S. Xylazine is a veterinary sedative with no approval for human use and is increasingly present in overdose deaths in the United States, compounding the overdose crisis. California healthcare providers and community-based organizations serving people who use drugs should be vigilant for the presence of xylazine.​​

  • Bicillin® L-A (Benzathine Penicillin G) Shortag​​e​​​

    CDPH/Health​​​​​ Advisory - June 1, 2023 - ​​The Centers for Disease Control and Prevention (CDC) and the U.S. Food and Drug Administration (FDA) have announced and listed long-acting penicillin G benzathine injectable suspension products (Bicillin® L-A) on their respective drug shortage webpages, estimating a recovery timeframe in Q4 2023. This is of considerable concern to California as the state continues to see significant increases in syphilis, including syphilis in pregnant persons and congenital syphilis in infants. CDPH recommends prioritizing Bicillin® L-A for pregnant people with syphilis infection or exposure, infants with congenital syphilis infection or exposure, and patients with contraindications to doxycycline. Health care providers can monitor the Bicillin® L-A drug shortages on the FDA Drug Shortages webpage.​​

  • California ​​Healthcare Providers Preventing a Resurgence of Mpox Cases in California​
    CDPH/Health​​​​​ Advisory - June 1, 2023 - ​​While the rate of mpox has declined precipitously since its peak in August 202​2, mpox transmission has continued in California, and other states have recently reported a resurgence of mpox cases​. On May 30, 2023 CDPH sent a letter to Californian health care providers as a call to action to remain vigilant in mpox prevention, recognition, and testing, especially during the upcoming 2023 spring and summer season as people gather for festivals and events, including LGBTQ Pride Month in June. Information on how to diagnose, test for, and vaccinate mpox is included. The letter is available online​. Please contact CDPH STD Control Branch at​ with any questions.

  • Potential Risk for New Mpox Cases

    CDC/Health​​​​​ Update - May 15, 2023 - The Centers for Disease Control and​​ Prevention (CDC) is issuing this Health Alert Network (H​AN) Health Update to inform clinicians and public health agencies about the potential for new clusters or outbreaks of mpox cases and to provide resources on clinical evaluation, treatment, vaccination, and testing. 
  • ​Marburg Virus Disease Outbreaks in Equatorial Guinea and Tanzania

    CDC/Health​​​​​ Advisory - April 6, 2023 - ​​The Centers for Disease Control and​​ Prevention (CDC) is issuing this Health Alert Network (H​AN) Health Advisory​ to notify clinicians and public health departments in the United States about two confirmed outbreaks of Marburg virus disease (MVD)—one in Equatorial Guinea and one in Tanzania. This Health Advisory provides information about these outbreaks to increase awareness of the risk of imported cases in the United States.

  • Updates on Identification, Laboratory Testing, Management and Treatment, and Vaccination for Mpox Virus Infection in California
    CDPH/Hea​lth​​​​​ Advisory - April 4, 2023 - ​​The California Deparment of Public Health (CDPH) are alerting healthcare providers of the need to identify and test, including testing for HIV and STDs in people with mpox. This advisory includes information on management, treatment, vaccination and updates to information and recommendations about severe mpox, including recent CDC interim clinical treatment considerations for severe mpox.​

  • Elevated Norovirus Activity in California 
    CDPH/Health​​​​​ Advisory - March 28, 2023 - ​​The California Deparment of Public Health (CDPH) are alerting healthcare providers regarding Norovirus activity. Since February 1, 2023, at least 25 outbreaks of norovirus in California have been confirmed by laboratory testing, likely reflecting hundreds of illnesses in the state. CDPH reminds healthcare providers to report all outbreaks of acute gastroenteritis, including suspected outbreaks of norovirus, to their local health departments.  ​

  • Measles Exposure at a Large Gathering in Kentucky, F​ebruary 2023 and Global Measles Outbreaks  
    CDC/Health​​​​​ Advisory - March 3, 2023 - ​​The Centers for Disease Control and​​ Prevention (CDC) is issuing this Health Alert Network (H​AN) Health Advisory​ to notify clinicians and public health officials about a confirmed measles case at a large gathering. This Health Advisory also highlights other recent large global measles outbreaks and associated U.S. importations, and the importance of early recognition, diagnosis, and appropriate treatment. CDC recommends that clinicians be on alert for cases of measles that meet the case definition.

  • Increased Chikungunya Virus Activity in Paraguay and Associated Risk to Travelers​

    CDC/Health​​​​​ Advisory - March 2, 2023 - ​​The Centers for Disease Control and​​ Prevention (CDC) is issuing this Health Alert Network (H​AN) Health Advisory to notify clinicians and public health authorities of an increase in the number of cases of chikungunya reported in Paraguay. The Health Advisory provides information on the current status of the chikungunya outbreak in Paraguay and advises on evaluating and testing travelers returning from Paraguay with signs and symptoms consistent with chikungunya virus infection.

  • Increase in Extensively Drug-Resistant Shigellosis in the United States ​
    CDC/Health​​​​​ Advisory - Februa​​​ry 24, 2023 - ​​The Centers for Disease Control and​​ Prevention (CDC) is issuing this Health Alert Network (H​AN) Health Advisory a​bout the increase in extensively drug-resistant (XDR) Shigella​ infections (shige​llosi​s) reported through national surveillance systems. CDC asks healthcare professionals to be vigilant about suspecting and reporting cases of XDR Shigella infection to their local or state health department and educating patients and communities at increased risk about prevention and transmission.

  • Emergence of Candida auris in Healthcare Facilities in Northern California​

    CDPH/Health Advi​​sory - February 8, 2023 - The California Department of Public Health (CDPH) and local public health partners are alerting healthcare providers of the emergence of epidemiologically-linked Candida auris (C. auris) cases associated with acute care hospital (ACH), skilled nursing facility (SNF), and outpatient settings in Sacramento and Stanislaus counties since September 2022.

  • Outbreak of Extensiv​ely Drug-resistant Pseudomonas aeruginosa Associated with Artificial Tears   

    CDC/Health Advisory - February 1, 2023 - ​​The Centers for Disease Control and Prevention (CDC) is issuing this Health Alert Network (HAN) Health Advisory a​bout infections with an extensively drug-resistant strain of Verona Integron-mediated Metallo-β-lactamase (VIM) and Guiana-Extended Spectrum-β-Lactamase (GES)-producing carbapenem-resistant Pseudomonas aeruginosa (VIM-GES-CRPA) in 12 states. 

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