Raw Milk and Salmonella, Mass THC Intoxication, and more

["Morbidity and Mortality Weekly Report \(MMWR\) \(CDC\)" <no-reply@xxxxxxxxxxxxxxxxxxxx>]

THC in Pizza Dough

July 24, 2025

In this Issue

Salmonella outbreak, raw milk — CA	THC intoxication, restaurant food — WI

WEEKLY REPORT

Outbreak of Salmonella Typhimurium Infections Linked to Commercially Distributed Raw Milk

Over 170 people developed Salmonella infection in late 2023 and early 2024, mostly in California, in one of the largest documented foodborne outbreaks linked to raw milk in recent U.S. history. Most patients were children (70%), and the majority of these children were hospitalized. Local and state public health agencies identified the outbreak strain of Salmonella in raw milk and cheese made from raw milk from a single dairy farm in California.

• Tetrahydrocannabinol Intoxication from Food at a Restaurant

  In 2024, at least 85 people in Wisconsin, ranging from 1–91 years of age, experienced tetrahydrocannabinol (THC) intoxication after eating food from a restaurant that mistakenly used THC-infused oil from a shared kitchen to prepare pizza and bread dough.

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MOST READ THIS WEEK

• Notes from the Field: Early-Season Human Plague Transmitted from an Infected Cat — Oregon, January 2024 
• Notes from the Field: Primary Amebic Meningoencephalitis Associated with Nasal Irrigation Using Water from a Recreational Vehicle — Texas, 2024
• Foodborne Botulism Outbreak After Consumption of Home-Canned Cactus (Nopales) — Fresno County, California, June 2024 
• Interim Evaluation of Respiratory Syncytial Virus Hospitalization Rates Among Infants and Young Children After Introduction of Respiratory Syncytial Virus Prevention Products — United States, October 2024–February 2025 
• Antiretroviral Postexposure Prophylaxis After Sexual, Injection Drug Use, or Other Nonoccupational Exposure to HIV — CDC Recommendations, United States, 2025 

In Case You Missed It

West Nile Virus and Other Nationally Notifiable Arboviral Diseases — United States, 2023

In 2023, arboviral disease cases were reported from all contiguous U.S. states; most occurred during April–December. West Nile virus (WNV) cases were most common, followed by Powassan virus disease cases, which increased from the previous record high in 2022. Three WNV disease cases were reported among patients infected though organ transplantation from two donors. La Crosse virus was the most common cause of arboviral disease among children, with most cases classified as neuroinvasive.

Notes from the Field: Assessment of Awareness, Use, and Access Barriers to Cooling Centers in Maricopa County, Arizona — August 1–September 15, 2023

In this cooling center evaluation involving 944 cooling center visitors and 1,260 general public respondents in Maricopa County during summer 2023, street signage was considered the best way to advertise cooling centers by 56% of visitors and 69% of general public respondents. A majority of visitors indicated they would like centers to be open until at least 7 p.m. Lack of transportation to centers was the most common barrier to use, described by 31% of visitors.

CONTINUING EDUCATION

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Don’t miss out! This free CE activity expires soon: Measles — United States, January 1, 2020–March 28, 2024

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