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Health Alert Network (HAN)

City Health Information (CHI)

End Racism in Clinical Algorithms

NYC REACH

Public Health Detailing Action Kits

Training Opportunities

Professional Publications

New York City Antibiogram

Supporting Peers and Community Health Workers

NYC Health Map

Clinical and Public Health Services


Health Alert Network (HAN)

The Health Alert Network (HAN) contains public health information for medical providers, including:

Up-to-date health alert information, delivered to your inbox and archived on the web

An online document library on public health topics

An online community to exchange information and ideas with colleagues

Subscribe to HAN

Emergency Reporting Phone Numbers

General Information: 311 or 877-692-3647
Bureau of Communicable Disease Reportables: 866-NYC-DOH1 (866-692-3641)

Poison Control: 800-222-1222 or 212-POISONS (212-764-7667)
Terrorism Hotline: 888-NYC-SAFE (888-692-7233)

Office of Emergency Management: 718-422-8700
Chief Medical Examiner: 212-447-2030

All Health Alerts and Advisories are in PDF format. You need to have Adobe Reader to read PDF files.

Alerts, 2025

Alerts will be published here.

Advisories, 2025

Advisory #3: Ebola Outbreak Caused by Sudan virus in Uganda

Advisory #2: Elevated Concentrations of Mercury in Skin Lightening Creams

Advisory #1: Accelerated Subtyping of Influenza A in Hospitalized Patients

CDC's Health Alert Network (HAN)

Alerts Archive

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2024

Alert #6: Protect Your Patients at Risk of Heat-Related Death During Extreme Heat

Alert #5: Recall of Boar’s Head Deli Meat Due to Possible Contamination with Listeria monocytogenes (NYS)

Alert #4: Protect Your Patients at Risk of Heat-Related Death During Extreme Heat

Alert #3: Protect Your Patients at Risk of Heat-Related Death During Extreme Heat

Alert #2: Protect Your Patients at Risk of Heat-Related Death During Extreme Heat

Alert #1: Prepare Your Patients at Risk of Heat-Related Death: Extreme Heat Coming

2023

Alert #24: Increase in Hepatitis A Diagnoses among Men Who Have Sex with Men

Alert #18: Prepare Your Patients at Risk of Heat-Related Death: Extreme Heat

Alert #15: Prepare Your Patients at Risk of Heat-Related Death: Extreme Heat Coming

Alert #9: Guidance During Wildfire Smoke

Alert #3: Increased Chikungunya Virus Activity in Paraguay and Associated Risk to Travelers

Alert #2: Increase in Extensively Drug-Resistant Shigellosis in the United States

2022

Alert #21: West Nile Virus: Record Number of Positive Mosquito Pools in New York City; Two Human Cases Reported

Alert #20: Update on Poliovirus in New York City

Alert #19: Extreme Heat Event August 8 and 9, 2022: Help Prevent Heat-Related Deaths

Alert #17: Extreme Heat Event August 4 and 5, 2022: Help Prevent Heat-Related Deaths

Alert #14: Extreme Heat Event July 20 and 21, 2022: Help Prevent Heat-Related Deaths

Alert #8: Test for Legionella in Adults with Pneumonia

Alert #3: Increases in Gonorrhea and Syphilis Among Females in New York City

2021

Alert #34: Investigation of a Listeriosis Cluster in Brooklyn

Alert #29: Heat Event August 25 and 26, 2021: Help Prevent Heat-Related Illness and Death

Alert #25: Investigation of a Legionnaires’ Disease Cluster in Central Harlem

Alert #23: Heat Event August 11-13, 2021: Help Prevent Heat-Related Illness and Death

Alert #16: West Nile Virus: Increasing Positive Mosquito Pools and Human Cases Under Investigation in New York City

Alert #14: Heat Event July 15 and 16, 2021: Help Prevent Heat-Related Illness and Death

Alert #12: Heat Event July 6 and 7, 2021: Help Prevent Heat-Related Illness and Death

Alert #11: Heat Event June 28, 2021 to June 29, 2021: Help Prevent Heat-Related Illness and Death

Alert #7: NYC Health Departments Recommends Hepatitis A Vaccine for Persons Who Are Experiencing Homelessness, Use Drugs, or Were Recently Incarcerated, in Response to Increasing Hepatitis A Cases in These Populations

Alert #6: Cases of Cerebral Venous Sinus Thrombosis with Thrombocytopenia after Receipt of the Johnson & Johnson COVID-19 Vaccine

Advisories Archive

2024

Advisory #31: Overdose is the Leading Cause of Pregnancy-Associated Death in NYC

Advisory #30: CDC Health Advisory: First Case of Clade I Mpox Diagnosed in the United States

Advisory #29: Elevated Levels of Lead, Mercury, Arsenic and Cadmium in Traditional Health Remedies

Advisory #28: CDC Health Update: Prevention Strategies for Mpox, including Vaccinating People at Risk via Sexual Exposure, for U.S. Travelers Visiting Countries with Clade I Mpox Outbreaks

Advisory #27: Marburg Virus Disease Outbreak in the Republic of Rwanda

Advisory #26: Travel-Associated Infectious Diseases

Advisory #25: CDC Advisory: Increase in Human Parvovirus B19 Activity in the United States

Advisory #24: Increased Oropouche Virus Activity and Associated Risk to Travelers

Advisory #23: Discontinue Use of Ciprofloxacin for Invasive Meningococcal Disease Post-Exposure Prophylaxis

Advisory #22: CDC Alert: Mpox Caused by Human-to-Human Transmission of Monkeypox Virus in the Democratic Republic of the Congo with Spread to Neighboring Countries

Advisory #21: Pesticide Spraying to Prevent West Nile Virus in New York City

Advisory #20: Carfentanil and Medetomidine in the NYC Drug Supply

Advisory #19: Early and Increasing West Nile Virus in Mosquitoes in New York City

Advisory #18: Pesticide Spraying to Prevent West Nile Virus in New York City

Advisory #17: CDC Advisory: Increased Risk of Dengue Virus Infections in the United States

Advisory #16: Legionellosis in NYC

Advisory #15: NYC Health Department Recommendations on Destigmatizing and Improving Provider Attitudes Towards Pain in Sickle Cell Disease

Advisory #14: Guidance During Wildfire Smoke

Advisory #13: Tick-borne Disease Advisory

Advisory #12: Updates on Mpox in New York City

Advisory #11: CDC Advisory: Adverse Effects Linked to Counterfeit or Mishandled Botulinum Toxin Injections

Advisory #10: Continued Increase in Leptospirosis Cases in New York City

Advisory #9: Help Prevent Heat-Related Illness and Death

Advisory #8: CDC Advisory: Increase in Invasive Serogroup Y Meningococcal Disease in the United States

Advisory #7: CDC Advisory: 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

Advisory #6: Prepare Patients with Asthma for Pollen Season

Advisory #5: Increase in Pertussis Cases in New York City

Advisory #4: Increases in Syphilis Among Females and Congenital Syphilis in New York City

Advisory #3: Be Vigilant for Measles Cases (NYS)

Advisory #2: COVID-19 Treatments Transition to Commercial Distribution

Advisory #1: NYC DOHMH Recommends Masking In Healthcare and Residential Facilities

2023

Advisory #26: CDC Advisory: Confirmed Rocky Mountain Spotted Fever among People with Recent Travel to Tecate, Mexico

Advisory #25: CDC Advisory: Mpox Caused by Human-to-Human Transmission of Monkeypox Virus with Geographic Spread in the Democratic Republic of the Congo

Advisory #23: CDC Advisory: Limited Availability of Nirsevimab in the United States

Advisory #22: 2023-2024 Updated COVID-19 Vaccines Recommended for Everyone 6 Months of Age and Older

Advisory #21: CDC Advisory: Locally Acquired Malaria Cases Identified in Florida, Texas, and Maryland

Advisory #20: CDC Advisory in Partnership with NYS: Increased Respiratory Syncytial Virus (RSV) Activity in Parts of the Southeastern United States: New Prevention Tools Available to Protect Patients

Advisory #19: CDC Advisory: Severe Vibrio vulnificus Infections in the United States Associated with Warming Coastal Waters

Advisory #17: Pesticide Spraying to Prevent West Nile Virus Continues in New York City

Advisory #16: West Nile Virus: Positive Mosquito Pools in New York City

Advisory #14: Pesticide Spraying to Prevent West Nile Virus in New York City

Advisory #13: Tick-borne Disease Advisory

Advisory #12: Poisonings Related to Drinking Poppers (Alkyl Nitrites)

Advisory #11: Legionellosis in New York State

Advisory #10: Fungal Meningitis in U.S. Patients Who Underwent Surgical Procedures Under Epidural Anesthesia in Matamoros, Mexico

Advisory #8: CDC Advisory: Potential Risk for New Mpox Cases

Advisory #7: Help Prevent Heat-Related Illnesses and Death

Advisory #6: Increase in Invasive Group A Streptococcal Infections in New York State

Advisory #5: CDC Advisory: Outbreaks of Marburg Virus Disease in Equatorial Guinea and Tanzania

Advisory #4: Spring is Here: Prepare Patients with Asthma for Spring Pollen Season

Advisory #1: CDC Advisory: Outbreak of Extensively Drug-resistant Pseudomonas aeruginosa Associated with Artificial Tears

2022

Advisory #34: Increase in Pediatric Invasive Group A Streptococcal Infections

Advisory #33: Xylazine and Fentanyl in the New York City Drug Supply

Advisory #32: CDC Health Update: Important Updates on COVID-19 Therapeutics for Treatment and Prevention

Advisory #31: CDC Health Advisory: Interim Guidance for Clinicians to Prioritize Antiviral Treatment of Influenza in the Setting of Reduced Availability of Oseltamivir

Advisory #30: Update on Managing Monkeypox in Patients Receiving Therapeutics

Advisory #29: Increased Respiratory Virus Activity, Especially Among Children

Advisory #28: Prescribe COVID-19 Therapeutics to Prevent Severe Disease, Hospitalization and Death This Winter

Advisory #27: Travel-Acquired Mosquito-Borne and Enteric Diseases

Advisory #26: Outbreak of Ebola Virus Disease in Central Uganda

Advisory #25: CDC Advisory: Severe Manifestations of Monkeypox Among People Who Are Immunocompromised Due to HIV or Other Conditions

Advisory #24: CDC Advisory: Increase in Severe Respiratory Illnesses Associated with Rhinoviruses and/or Enteroviruses Including EV-D68

Advisory #23: Pesticide Spraying to Reduce Mosquito Activity and Control West Nile Virus Continues in New York City

Advisory #22: Poisonings and Death Related to Intentional Sodium Nitrite Ingestions

Advisory #18: CDC Advisory: Melioidosis Locally Endemic in Areas of the Mississippi Gulf Coast

Advisory #16: Accessing Tecovirimat for People with Monkeypox

Advisory #15: Pesticide Spraying to Reduce Mosquito Activity
and Control West Nile Virus in New York City

Advisory #13: Update on Monkeypox in New York City

Advisory #12: CDC Advisory: Recent Reports of Human Parechovirus (PeV) in the United States — 2022

Advisory #11: Monkeypox Transmission and Detection in New York City

Advisory #10: Tick-borne Disease Advisory

Advisory #9: Help Prevent Heat-Related Illness and Death

Advisory #7: CDC Advisory: COVID-19 Rebound After Paxlovid Treatment

Advisory #6: CDC Advisory: Monkeypox Virus Infection in the United States and Other Non-endemic Countries — 2022

Advisory #5: Spring is Here: Prepare Patients with Asthma for Spring Pollen Season

Advisory #4: COVID-19 Pre-Exposure Prophylaxis for Immunocompromised Patients and Treatment Updates

Advisory #2: Paxlovid is Available for COVID-19 Treatment in New York City

Advisory #1: New York City COVID-19 Isolation and Quarantine Updates

2021

Advisory #39: COVID-19 Oral Antiviral Treatments Authorized and Severe Shortage of Oral Antiviral and Monoclonal Antibody Treatment Products

Advisory #38: Omicron SARS-CoV-2 Variant Identified in New York City

Advisory #37: Elevated Levels of Lead in Traditional Ceramic Ware

Advisory #36: Pesticide Spraying Notification to Reduce Mosquito Activity and Control West Nile Virus in Manhattan and Staten Island

Advisory #35: Increase in Leptospirosis Cases in New York City

Advisory #33: New Program Offers Compensation for Proactive Vaccination Counseling; Commissioner’s Advisory Directs Health Care Providers to Use Every Opportunity to Offer COVID-19 Vaccine Information

Advisory #32: Pesticide Spraying Notification to Reduce Mosquito Activity and Control West Nile Virus in Brooklyn, Queens and Staten Island

Advisory #31: Pesticide Spraying Notification to Reduce Mosquito Activity and Control West Nile Virus in the Brooklyn

Advisory #30: Pesticide Spraying Notification to Reduce Mosquito Activity and Control West Nile Virus in the Bronx and Staten Island

Advisory #28: Pesticide Spraying Notification to Reduce Mosquito Activity and Control West Nile Virus in the Bronx and Manhattan

Advisory #27: Pesticide Spraying Notification to Reduce Mosquito Activity and Control West Nile Virus in Brooklyn

Advisory #26: Atypical Summer Transmission of Respiratory Syncytial Birus (RSV)

Advisory #24: Pesticide Spraying Notification to Reduce Mosquito Activity and Control West Nile Virus in the Bronx and Queens

Advisory #22: Pesticide Spraying Notification to Reduce Mosquito Activity and Control West Nile Virus in Queens

Advisory #21: Pesticide Spraying Notification to Reduce Mosquito Activity and Control West Nile Virus in Brooklyn and Queens

Advisory #20: Pesticide Spraying Notification to Reduce Mosquito Activity and Control West Nile Virus in Queens

Advisory #19: Pesticide Spraying Notification to Reduce Mosquito Activity and Control West Nile Virus in Queens

Advisory #18: Pesticide Spraying Notification to Reduce Mosquito Activity and Control West Nile Virus in Staten Island and Queens

Advisory #17: Pesticide Spraying Notification to Reduce Mosquito Activity and Control West Nile Virus in Bronx

Advisory #15: Pesticide Spraying Notification to Reduce Mosquito Activity and Control West Nile Virus in Staten Island

Advisory #13: Pesticide Spraying Notification to Reduce Mosquito Activity and Control West Nile Virus in Queens

Advisory #10: Tick-borne Disease Advisory

Advisory #9: Help Prevent Heat-Related Illness and Death Among People Most At Risk of Heat-Health Impacts During the COVID-19 Pandemic

Advisory #8: Administration of Johnson & Johnson/Janssen COVID-19 Vaccine Can Resume in New York City

Advisory #5: Spring is Here: Prepare Patients with Asthma for Spring Pollen Season

Advisory #4: Updated Guidance for Use of Respirators by Health Care Personnel Caring for Patients With and Without COVID-19 in Health Care Settings

Advisory #3: Collect and Report Race and Ethnicity Data to Help Ensure Equitable Access to COVID-19 Vaccines

Advisory #2: Select New York State Phase 1b Groups
Are Now Eligible for COVID-19 Vaccination

Advisory #1: All New Yorkers in the New York State Phase 1a Group Are Eligible for COVID-19 Vaccination