LAHAN Archive 2013-2024

The Department of Public Health (DPH) emails priority communications to health care professionals through LAHAN. Topics include local outbreaks, emerging health issues, immunizations, and drug shortages. To receive LAHAN communications, click the ‘subscribe’ button. It takes less than a minute to sign up. DPH will not share your contact information.

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LAHAN Communication Types

Red Box Alert:
Conveys the highest level of importance; warrants immediate action or attention.
Orange Box Advisory:
Provides important information for a specific incident or situation; may not require immediate action.
Yellow Box Update:
Provides updated information regarding an incident or situation; unlikely to require immediate action.
Blue Box Information:
Provides general information that is not necessarily considered to be of an emergent nature.

To see 2025-26 health alerts, please click here.

Archive

2013   2014   2015   2016   2017   2018   2019   2020   2021   2022   2023   2024   2025

2024 HAN Communications

December 6, 2024
Evaluation and Testing for Human Avian Influenza A(H5N1) Infection
CDPH Health Update (Revised 12.16.24) 
PDF | Web/Mobile

November 22, 2024
Mycoplasma pneumoniae Infections Among Children and Adolescents During Fall and Winter Respiratory Illness Season
CDPH Health Advisory  
PDF | Web/Mobile

November 19, 2024
First Case of Clade I Mpox Diagnosed in the United States
CDC Health Advisory  
PDF | Web/Mobile

October 16, 2024
Updated Syphilis Screening Recommendations
CDPH Health Update  
PDF | Web/Mobile

October 11, 2024
California Statewide Discontinuation of Ciprofloxacin for Invasive Meningococcal Disease Post-Exposure Prophylaxis
CDPH Health Advisory  
PDF | Web/Mobile

October 10, 2024
First Cases of Human Avian Influenza A (H5N1) in California & Preparation for the Respiratory Virus Season
CDPH Health Advisory  
PDF | Web/Mobile

October 3, 2024
First Marburg Virus Disease Outbreak in the Republic of Rwanda
CDC Health Advisory  
PDF | Web/Mobile

September 24, 2024
Mpox Clade I & II – Prevention in the US and Before Travel
CDC/LAC DPH Health Update  
PDF | Web/Mobile

September 18, 2024
Cluster of Locally Acquired Cases of Dengue in Los Angeles County
LAC DPH Health Update  
PDF | Web/Mobile

September 17, 2024
Human Infections with Baylisascaris procyonis (Raccoon Roundworm)
LAC DPH Health Alert  
PDF | Web/Mobile

September 09, 2024
Locally Acquired Case of Dengue in Los Angeles County
LAC DPH Health Alert  
PDF | Web/Mobile

September 4, 2024
Detection of Highly Pathogenic Avian Influenza (HPAI) A(H5N1) in California Dairy Cattle
CDPH Health Advisory  
PDF | Web/Mobile

August 16, 2024
Increased Oropouche Virus Activity and Associated Risk to Travelers
CDC Health Advisory  
PDF | Web/Mobile

August 13, 2024
Increase in Human Parvovirus B19 Activity in the United States
CDC Health Advisory  
PDF | Web/Mobile

August 09, 2024
Rise in Extensively Drug-Resistant Shigella Strains-January to May 2024
CDPH Health Advisory  
PDF | Web/Mobile

August 07, 2024
Mpox Caused by Human-to-Human Transmission of Monkeypox Virus in the Democratic Republic of the Congo with Spread to Neighboring Countries
CDC Health Update  
PDF | Web/Mobile

June 03, 2024
Webinar with CME. Dengue on 7/11/24, 12pm
LAC DPH Health Information  
Flyer | Web/Mobile

June 26, 2024
Increased Risk of Dengue Virus Infections in the United States
CDC Health Advisory  
PDF | Web/Mobile

June 25, 2024
Severe Acute Illnesses and Hospitalizations Linked to Diamond Shruumz ™ Chocolate Bars, Cones, and Gummies (Microdose Products)
CDPH Health Advisory  
PDF | Web/Mobile

June 20, 2024
Reports of Rare, Severe Dermatophyte Infections Associated with Sexual Contact in the United States
CDPH Health Advisory  
PDF | Web/Mobile

June 13, 2024
Disrupted Access to Prescription Stimulant Medications Could Increase Risk of Injury and Overdose
CDC Health Advisory  
PDF | Web/Mobile

June 12, 2024
Influenza A Testing Guidance: Enhanced Surveillance During the Summer Months
CDPH Health Update  
PDF | Web/Mobile
Note for laboratories: Please see LAC DPH Laboratory Alert Notification--Enhanced Influenza Surveillance (6-13-24).

June 12, 2024
Severe Illness Potentially Associated with Consuming Diamond Shruumz™ Brand Chocolate Bars, Cones, and Gummies
CDC Health Advisory  
PDF | Web/Mobile

May 21, 2024
Meningococcal Disease—Ciprofloxacin Resistance in Southern California and Cases Linked to Travel to the Kingdom of Saudi Arabia
LAC DPH Health Advisory  
PDF | Web/Mobile

May 10, 2024
Local Outbreak of Hepatitis A among Persons Experiencing Homelessness and/or who use Illicit Drugs
LAC DPH Alert  
PDF | Web/Mobile

April 23, 2024
Adverse Effects Linked to Counterfeit or Mishandled Botulinum Toxin Injections
CDC Health Advisory  
PDF | Web/Mobile

March 18, 2024
Fatality from Lead Poisoning Linked to Use of Hemorrhoid Ointment from Vietnam
CDPH Health Advisory  
PDF | Web/Mobile

April 05, 2024
Highly Pathogenic Avian Influenza A(H5N1) Virus: Identification of Human Infection and Recommendations for Investigations and Response
CDC Health Advisory  
PDF | Web/Mobile

March 28, 2024
Increase in Invasive Serogroup Y Meningococcal Disease in the United States
CDC Health Advisory  
PDF | Web/Mobile

March 18, 2024
Extension of Long-Acting Benzathine Penicillin G (Bicillin® L-A) Shortage
CDPH Health Advisory  
PDF | Web/Mobile

March 18, 2024
Increase in Global and Domestic Measles Cases and Outbreaks: Ensure Children in the United States and Those Traveling Internationally 6 Months and Older are Current on MMR Vaccination
CDC Health Advisory  
PDF | Web/Mobile

February 1, 2024
First LA County Measles Case
LAC DPH Health Alert  
PDF | Web/Mobile

January 19, 2024
Substantial Rise in Coccidioidomycosis in California: Recommendations for Healthcare Providers
CDPH Health Advisory
PDF | Web/Mobile

2023 HAN Communications

December 19, 2023
Urgent Need to Increase Immunization Coverage for Influenza, COVID-19, and RSV Immunizations and Use of Authorized/Approved Therapeutics in the Setting of Increased Respiratory Disease Activity During the 2023 – 2024 Winter Season
CDC Health Advisory
PDF | Web/Mobile

December 8, 2023
Severe and Fatal Confirmed Rocky Mountain Spotted Fever among People with Recent Travel to Tecate, Mexico
CDC Health Advisory
PDF | Web/Mobile

December 7, 2023
Mpox Caused by Human-to-Human Transmission of Monkeypox Virus with Geographic Spread in the Democratic Republic of the Congo
CDC Health Advisory
PDF | Web/Mobile

November 14, 2023
High Blood Lead Levels in Children Consuming Recalled Cinnamon Applesauce Pouches
CDC Health Advisory
PDF | Web/Mobile

October 24, 2023
Limited Availability of Nirsevimab in the United States--Interim CDC Recommendations to Protect Infants from RSV during the 2023-2024 Respiratory Virus Season
CDC Health Advisory
PDF | Web/Mobile

October 23, 2023
First Locally Acquired Case of Dengue in California Detected in Pasadena
LAC DPH Health Alert
PDF | Web/Mobile

October 11, 2023
Preparation for Respiratory Virus Season (COVID-19, Influenza and RSV)
CDPH Health Advisory
PDF | Web/Mobile

October 6, 2023
Prevent Severe RSV in Infants with Maternal or Infant Immunization
LAC DPH Health Advisory
PDF | Web/Mobile

October 4, 2023
Influenza and COVID-19 Immunization or Masking Requirement for Healthcare Personnel
LAC DPH Health Update
PDF | Web/Mobile

September 14, 2023
2023-2024 COVID-19 Vaccines
LAC DPH Health Advisory
PDF | Web/Mobile

September 6, 2023
Immunize Infants and Older Adults to Protect them from Severe RSV
LAC DPH Health Advisory
PDF | Web/Mobile

September 1, 2023
Severe Vibrio vulnificus Infections in the United States Associated with Warming Coastal Waters
CDC Health Advisory
PDF | Web/Mobile

August 29, 2023
Outbreak of Aeromonas Skin Infections Associated with an Adventure Race, Sonoma, California
CDPH Health Advisory
PDF | Web/Mobile

August 28, 2023
Important Updates on Locally Acquired Malaria Cases Identified in Florida, Texas, and Maryland
CDC Health Update
PDF | Web/Mobile

August 16, 2023
Listeria Associated with Soft Serve Ice Cream Distributed to Long-Term Care Facilities
CDPH Health Advisory
PDF | Web/Mobile

July 25, 2023
Global Epidemic Comes to California - Silicosis in Countertop Worker
CDPH Health Advisorys
PDF | Web/Mobile

July 3, 2023
Certifying Deaths Due to COVID-19
LAC DPH Health Information
PDF | Web/Mobile

June 26, 2023
Locally Acquired Malaria Cases Identified in the United States
CDC Health Advisory
PDF | Web/Mobile

June 22, 2023
Request to Submit Specimens from Patients Receiving Intensive Care for Influenza A to Public Health Laboratories
CDPH Health Update
PDF | Web/Mobile

June 21, 2023
Guidance on Measles during the Summer Travel Season
CDC Health Advisory
PDF | Web/Mobile

June 2, 2023
Bicillin® L-A (Benzathine Penicillin G) Shortage
CDPH Health Advisory
PDF | Web/Mobile

May 15, 2023
Potential Risk for New Mpox Cases
CDC Health Update
PDF | Web/Mobile

April 4, 2023
Marburg Virus Disease Outbreaks in Equatorial Guinea and Tanzania
CDC Health Advisory
PDF | Web/Mobile

April 6, 2023
Updates on Identification, Laboratory Testing, Management and Treatment, and Vaccination for Mpox Virus Infection in California
CDPH Health Advisory
PDF | Web/Mobile

March 29, 2023
Elevated Norovirus Activity in California
CDPH Health Advisory
PDF | Web/Mobile

March 3, 2023
Measles Exposure at a Large Gathering in Kentucky, February 2023 and Global Measles Outbreaks
CDC Health Advisory
PDF | Web/Mobile

March 2, 2023
Increased Chikungunya Virus Activity in Paraguay and Associated Risk to Travelers
CDC Health Advisory
PDF | Web/Mobile

February 24, 2023
Increase in Extensively Drug-Resistant Shigellosis in the United States
CDC Health Advisory
PDF | Web/Mobile

February 24, 2023
Xylazine in Illicit Drugs Increasing Overdose Risks
LAC DPH Health Advisory
PDF | Web/Mobile

February 2, 2023
Outbreak of Extensively Drug-resistant Pseudomonas aeruginosa Associated with Artificial Tears
CDC Health Advisory
PDF | Web/Mobile

2022 HAN Communications

December 23, 2022
CDC Health Advisory
Increase in Pediatric Invasive Group A Streptococcal Infections PDF | Web/Mobile

December 21, 2022
CDC Health Update
Important Updates on COVID-19 Therapeutics for Treatment and Prevention PDF | Web/Mobile

December 14, 2022
CDPH Health Advisory
Evaluating and Managing Travelers Returning from Ebola Outbreak Areas with Infectious Disease Symptoms PDF | Web/Mobile

November 29, 2022
CDPH Health Alert
Reminder to Prescribe COVID-19 Therapeutics to Mitigate Impact of Winter Respiratory Surge PDF | Note: CPDH revised and reissued the alert on 12/2/22 as Reminder to Lower Barriers to Prescribing COVID-19 Therapeutics to Mitigate Impact of COVID-19

November 18, 2022
CDC Health Update
Update on Managing Monkeypox in Patients Receiving Therapeutics PDF | Web/Mobile

November 16, 2022
LAC DPH Health Advisory
Increases of Flea-Borne Typhus PDF

November 10, 2022
LAC DPH Health Update
Antiviral Treatment and Chemoprophylaxis for Influenza Infection During SARS-CoV-2 Co-Circulation PDF

November 7, 2022
CDC Health Update
Update on Ebola Virus Disease (Sudan ebolavirus) Outbreak in Central Uganda PDF

November 4, 2022
CDC Health Advisory
Increased Respiratory Virus Activity, Especially Among Children, Early in the 2022-2023 Fall and Winter PDF

October 31, 2022
CDC Health Advisory
Outbreaks of Nontuberculous Mycobacteria Infections Highlight Importance of Maintaining and Monitoring Dental Waterlines PDF

October 20, 2022
LAC DPH Health Update
Fall Influenza and COVID-19 Vaccination PDF

October 6, 2022
CDC Health Advisory
Outbreak of Ebola virus disease (Sudan ebolavirus) in Central Uganda PDF

October 5, 2022
CDPH Health Advisory
Guidance for Safe Specimen Collection From Monkeypox (MPX) Lesions: Reminder to NOT De-roof Lesions and NOT Use Sharps PDF

October 3, 2022
CDPH Health Advisory
Early Respiratory Syncytial Virus Activity and Use of Palivizumab PDF

September 9, 2022
CDC Health Advisory
Severe Respiratory Illnesses Associated with Rhinoviruses and/or Enteroviruses Including EV-D68 – Multistate, 2022 PDF
September 9, 2022
LAC DPH Monkeypox Update
Severe Disease, Testing, and Vaccine Eligibility PDF

September 8, 2022
LAC DPH COVID-19 Updates
New Booster Recommendations, Observation Period, Co-Administration PDF

August 30, 2022
CDC Health Advisory
CDC Health Advisory: Variant Influenza Virus Infections: Recommendations for Identification, Treatment, and Prevention for Summer and Fall 2022 PDF

August 23, 2022
LAC DPH Health Advisory
Recent Report of Polio Case in Rockland County, New York PDF

August 12, 2022
LAC DPH Health Update
Monkeypox Updates Including Expedited Testing for PEH and Alternative JYNNEOS Dosing PDF

August 1, 2022
CDC Health Update
Monkeypox in People with HIV, Children and Adolescents, and People who are Pregnant or Breastfeeding PDF

July 29, 2022
CDC Health Update
Update for Clinicians on Testing and Treatment for Monkeypox PDF

July 27, 2022
CDC Health Advisory
Melioidosis Locally Endemic in Areas of the Mississippi Gulf Coast after Burkholderia pseudomallei Isolated in Soil and Water and Linked to Two Cases – Mississippi, 2020 and 2022 PDF

July 27, 2022
LAC DPH COVID-19 Update
Therapeutics for SNFs, and Novavax PDF

July 21, 2022
LAC DPH Health Update
Monkeypox Updates Including Provider Webinar Friday, July 22 PDF

July 14, 2022
LAC DPH Monkeypox Update
Vaccine Referrals & Expanded Commercial Laboratories PDF

July 12, 2022
CDC Health Advisory
Recent Reports of Human Parechovirus (PeV) in the United States—2022 PDF

July 11, 2022
LAC DPH Information
Understanding CA Child Care and School Immunization Requirements and Medical Exemptions PDF

July 8, 2022
LAC DPH Health Update
Monkeypox-Commercial Lab Testing, Reporting, & Vaccine Availability PDF

July 5, 2022
LAC DPH Health Update
Vaccinating Children 6 Months of Age and Older PDF

June 24, 2022
CDPH Health Advisory
Managing Monkeypox Virus Infection in California PDF

June 14, 2022
CDC Health Update
Updated Case-finding Guidance: Monkeypox Outbreak-United States, 2022 PDF

June 7, 2022
LAC DPH Health Update
Monkeypox Updates and Provider Webinar this Thursday, June 9, 2022 PDF

June 1, 2022
LAC DPH Health Update
Isolation and Quarantine for General Public PDF

May 27, 2022
LAC DPH Health Alert
Contaminated Ecstasy and Accidental Drug Overdoses PDF

May 27, 2022
CDPH Health Advisory
Monkeypox Virus Infection in the United States and Other Non-endemic Countries PDF

May 26, 2022
LAC DPH Health Advisory
Florida Meningococcal Outbreak in Gay, Bisexual, and Other MSM and Vaccine Recommendations for LAC PDF

May 24, 2022
LAC DPH COVID-19 Vaccine Update
Vaccine Recommendations-Boosters and Staying Up to Date with Doses PDF

May 24, 2022
CDC Health Advisory
COVID-19 Rebound After Paxlovid Treatment PDF

May 20, 2022
CDC Health Advisory
Monkeypox Virus Infection in the United States and Other Non-endemic Countries PDF 

May 17, 2022
CDPH Health Advisory
Seasonal Influenza Activity is Increasing in California PDF

May 16, 2022
CDPH Health Advisory
CDPH Advises Parents and Caregivers Against Making or Feeding Homemade Infant Formula to Infants PDF

May 12, 2022
May 5, 2022
April 29, 2022
April 26, 2022
April 21, 2022
March 31, 2022
March 18, 2022
March 2, 2022
February 25, 2022
LAC DPH Health Update
Revisions to Evusheld Dosing

February 17, 2022
February 11, 2022
February 09, 2022
February 3, 2022
January 28, 2022
January 8, 2022
January 7, 2022

2021 HAN Communications

December 31, 2021
December 30, 2021
December 27, 2021
December 27, 2021
December 23, 2021
December 20, 2021
December 8, 2021
December 3, 2021
December 2, 2021
December 2, 2021
November 30, 2021
November 24, 2021
November 5, 2021
November 3, 2021
November 2, 2021
October 27, 2021
October 23, 2021
LAC DPH Health Update
Booster Doses

October 22, 2021
October 14, 2021
October 14, 2021
September 29, 2021
September 27, 2021
September 20, 2021
September 14, 2021
September 10, 2021
August 26, 2021
August 14, 2021
August 10, 2021
August 09, 2021
August 06, 2021
CDPH State Public Health Officer Order:
Health Care Worker Vaccine Requirement (8-5-21)

July 28, 2021
CDPH State Public Health Officer Order:
Unvaccinated Workers in High Risk Settings (7-26-21)

July 27, 2021
July 17, 2021
July 6, 2021
June 30, 2021
June 10, 2021
June 1, 2021
LAC DPH COVID-19 Updates
SARS-CoV-2 Testing Guidelines and More

May 28, 2021
May 28, 2021
May 26, 2021
May 13, 2021
LAC DPH COVID-19 Vaccine Update:
Vaccination for Children and Homebound Persons

April 23, 2021
April 13, 2021
March 31, 2021
March 26, 2021
March 19, 2021
March 15, 2021
March 5, 2021
March 3, 2021
February 26, 2021
February 22, 2021
February 18, 2021
LAC DPH COVID-19 Update:
Vaccinated Persons and Quarantine

February 16, 2021
February 12, 2021
February 3, 2021
January 21, 2021
January 19, 2021
January 17, 2021
January 15, 2021

2020 HAN Communications

December 24, 2020
LAC DPH Health Advisory:
SARS-CoV-2 Virus Variant

December 23, 2020
December 21, 2020
October 7, 2020
December 4, 2020
LAC DPH Health Advisory:
COVID-19 Vaccine Update

November 24, 2020
October 29, 2020
October 28, 2020
October 7, 2020
August 20, 2020
July 28, 2020
July 18, 2020
July 17, 2020
July 13, 2020
July 13, 2020
July 6, 2020
July 4, 2020
June 23, 2020
June 2, 2020
LAC DPH Health Update:
COVID-19 Updates

June 1, 2020
May 14, 2020
May 12, 2020
LAC DPH Health Alert:
Pediatric Multi-System Inflammatory Syndrome Potentially Associated with COVID-19
Note: the case definition in this LAHAN is superseded by the 5/14/20 CDC HAN above.
May 11, 2020
May 8, 2020
May 1, 2020
April 22, 2020
April 16, 2020
LAC DPH Health Advisory:
SARS-CoV-2 Serology

April 13, 2020
April 7, 2020
April 2, 2020
March 28, 2020
March 25, 2020
March 19, 2020
March 13, 2020
LAC DPH Health Information:
Webinar with CME. Clinical Update II on Coronavirus Disease 2019 3/13/20, 12pm Website  Flyer

March 11, 2020
March 6, 2020
March 4, 2020
Februrary 29, 2020
February 14, 2020
LAC DPH Health Information:
Webinar with CME. Clinical Update on Coronavirus Disease 2019 2/21/20, 12pm Website  Flyer

February 7, 2020
LAC DPH Health Alert:
Measles Outbreak in LA County

February 1, 2020
January 28, 2020
January 26, 2020
January 17, 2020
January 10, 2020
January 10, 2020
January 8, 2020

2019 HAN Communications

December 16, 2019
December 12, 2019
November 21, 2019
November 19, 2019
November 7, 2019
October 2, 2019
August 30, 2019
August 28, 2019
August 12, 2019
July 30, 2019
July 23, 2019
July 5, 2019
July 2, 2019
June 12, 2019
May 24, 2019
May 7, 2019
April 26, 2019
LAC DPH Health Update:
Measles Prevention in LA County

April 22, 2019
LAC DPH Health Alert:
Measles Outbreak in LA County

April 3, 2019
February 21, 2019
February 19, 2019
February 15, 2019
January 23, 2019
January 22, 2019
January 14, 2019

2018 HAN Communications

December 10, 2018
November 30, 2018
November 26, 2018
November 21, 2018
November 20, 2018
October 18, 2018
October 12, 2018
October 4, 2018
October 1, 2018
September 7, 2018
August 20, 2018
August 10, 2018
August 9, 2018
July 31, 2018
July 11, 2018
July 2, 2018
June 11, 2018
June 8, 2018
May 25, 2018
May 24, 2018
May 23, 2018
April 25, 2018
April 11, 2018
March 15, 2018
March 9, 2018
January 4, 2018

2017 HAN Communications

Dec 27, 2017
Dec 13, 2017
Nov 14, 2017
Nov 11, 2017
Nov 2, 2017
Oct 24, 2017
Sept 19, 2017
Aug 9, 2017
Aug 3, 2017
July 31, 2017
July 19, 2017
July 7, 2017
June 1, 2017
May 17, 2017
May 4, 2017
April 19, 2017
March 9, 2017
Jan 31, 2017
Jan 19, 2017

2016 HAN Communications

December 24, 2020
LAC DPH Health Advisory:
SARS-CoV-2 Virus Variant

Dec 23, 2016
Dec 14, 2016
Nov 29, 2016
Oct 20, 2016
Oct 17, 2016
Sept 20, 2016
Aug 29, 2016
Aug 24, 2016
Aug 23, 2016
LAC DPH Health Alert: (Revised August 29)
Outbreak of Synthetic Cannabinoid (“Spice”) Overdoses


Aug 3, 2016
July 26, 2016
Jun 24, 2016
June 14, 2016
June 2, 2016
May 27, 2016
April 14, 2016
CDPH Drug Overdose Health Alert:
Fentanyl-Contaminated Street Norco

April 8, 2016
March 25, 2016
March 8, 2016
March 3, 2016
March 1, 2016
Feb 23, 2016
Feb 5, 2016
Feb 1, 2016
Jan 28, 2016
Jan 22, 2016
Jan 15, 2016
CDC Health Advisory:
Zika Virus Infections

Jan 5, 2016
LACDPH Health Update:
Guinea Declared Ebola-free

2015 HAN Communications

Oct 26, 2015
Oct 2, 2015
Sept 23, 2015
Sept 11, 2015
July 23, 2015
June 24, 2015
June 19, 2015
June 5, 2015
June 3, 2015
March 5, 2015
Feb 27, 2015
Feb 10, 2015
Jan 27, 2015
Jan 23, 2015
Jan 14, 2015
Jan 8, 2015

2014 HAN Communications

Dec 5, 2014

Nov 26, 2014
Nov 19, 2014
Oct 21, 2014
Oct 17, 2014
Oct 3, 2014
Sept 29, 2014
Sept 11, 2014
LACDPH Health Advisory:
Enterovirus 68 (EV-D68)

Sept 10, 2014
Aug 14, 2014
Aug 4, 2014
July 28, 2014
July 15, 2014
June 3, 2014
May 21, 2014
May 3, 2014
April 2, 2014
Jan 30, 2014
Jan 16, 2014

2013 HAN Communications