Personalized research briefing
Recent surveillance and outbreak reports relevant to harm reduction, infectious disease, and environmental health
These five studies were selected because they address surveillance, clinical recognition, and outbreak investigation in domains that match Marion County Center’s weekly harm reduction clinic, local epidemiology/infectious disease work, and environmental health operations. Each paper offers practical findings on detection, prevention, or response that can inform local monitoring, clinician engagement, and environmental/food-safety activities.
Trends in Emergency Department Visits Involving Cannabis Hyperemesis Syndrome Identified Using a New Diagnosis Code – United States, January 2023-May 2026.
After implementation of a new CHS-specific ICD-10-CM code on October 1, 2025, the monthly proportion of ED visits coded for cannabis hyperemesis syndrome (CHS) increased substantially and remained elevated through May 2026. The rise likely reflects improved recognition and coding as well as ongoing occurrence, with higher proportions among persons aged 15–24 years and females.
Why it matters for Marion County Center
Marion County Center’s harm reduction clinic may encounter people who use cannabis frequently and present with cyclical vomiting; awareness of CHS and its diagnostic coding can improve local triage, referral, and data capture. For the Center’s epidemiology services, updated coding means ED-based syndromic surveillance may now better detect CHS trends locally, aiding education and outreach planning.
West Nile Virus and Other Nationally Notifiable Arboviral Diseases – United States, 2024.
In 2024, West Nile virus accounted for most reported arboviral disease cases in the U.S.; most cases occurred in older adults and during July–September. The report emphasizes the need for timely surveillance, clinician testing for arboviruses in relevant seasons, and vector-control and personal protection measures.
Why it matters for Marion County Center
Marion County Center’s infectious disease and epidemiology responsibilities include seasonal surveillance and clinician guidance; these findings support prioritizing arboviral awareness, testing protocols, and public messaging before and during peak mosquito/tick activity. The report also reinforces the need to coordinate with vector-control activities and to target high-risk groups in outreach and clinic services.
Outbreak of Hepatitis A Linked to Frozen Blueberries, the Netherlands, 2024-2025.
An investigation of 24 hepatitis A cases in the Netherlands (Nov 2024–Feb 2025) identified the outbreak strain in a frozen blueberry product tied to a specific supermarket chain, implicating that product as the likely source. Combined consumption data and detection of viral RNA in the food supported the foodborne link.
Why it matters for Marion County Center
This outbreak illustrates methods—case interviews, product testing, and trace-back—that Marion County Center’s environmental health team can apply when investigating suspected foodborne hepatitis A exposures. Findings are relevant to local food-safety inspections, coordination with retail partners, and advising clinical staff about links between food exposures and hepatitis A testing.
Hepatitis A Outbreak in Skilled Nursing Facility, Los Angeles County, California, USA, 2025.
Investigation of five hepatitis A cases in a skilled nursing facility found transmission among residents and noted that three residents received vaccine after exposure; the authors suggest that both vaccine and immune globulin should be used for postexposure protection in congregate living settings. The report highlights the vulnerability of congregate facilities to hepatitis A spread and the importance of prompt postexposure prophylaxis.
Why it matters for Marion County Center
Marion County Center’s role in local infectious disease response and service delivery includes advising congregate settings; this study supports reviewing local protocols for hepatitis A exposure in long-term care, ensuring timely provision of both vaccine and immune globulin where indicated, and coordinating with facility partners for rapid containment. It also informs the Center’s clinical guidance and outreach to high-risk congregate populations.
Kudoa septempunctata Parasite-Associated Foodborne Disease Outbreaks, South Korea, 2015-2024.
National surveillance data from South Korea (2015–2024) indicate that reported Kudoa septempunctata-associated foodborne illness declined sharply during the COVID-19 pandemic and did not fully rebound through 2024, with evidence pointing to restaurant-based raw fish consumption as the principal transmission route. The analysis highlights how changes in dining patterns affect foodborne disease trends.
Why it matters for Marion County Center
For Marion County Center’s environmental health and food-safety work, this study underscores the importance of monitoring restaurant-linked exposure pathways and adapting inspection and education efforts based on local dining behaviors. Surveillance trends like these can help the Center anticipate shifts in foodborne risk and target prevention messaging to establishments and patrons about safe handling and consumption of high-risk foods.
Together, these studies underscore the value of timely surveillance, clinical recognition, and rapid environmental/foodborne investigation for protecting community health. They provide actionable evidence for aligning Marion County Center’s harm reduction clinic, epidemiology activities, and environmental health operations with current risks and response practices.
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