By Ethan Covey
The use of genomic analysis and wastewater testing data aided in identifying and addressing an outbreak of hepatitis A virus (HAV) in Los Angeles County (MMWR Morb Mortal Wkly Rep 2025;74[5]:66-68).
During April 2024, officials with the LA County Department of Public Health (DPH) identified three cases of HAV infection among people experiencing homelessness (PEH), compared with one case that had been confirmed among PEH during the preceding six months. The cases were identified via