BACKGROUND: Updated benchmark data on invasive fungal disease (IFD) in solid organ transplantation (SOT) and hematopoietic cell transplantation (HCT) recipients are necessary to increase clinical recognition and inform treatment and prevention strategies. We estimated IFD incidence and potential risk factors in transplant recipients in a large US commercial health insurance database. METHODS: We observed patients who received SOT or HCT during 2018-2022 until IFD development, disenrollment, or database end date (July 31, 2023). We calculated incidence (per 1000 person-years) and time to IFD development, comparing demographic features and underlying conditions for IFD versus non-IFD patients. RESULTS: Overall, 9143 patients received an SOT (5667 kidney, 2025 liver, 759 heart, 650 lung, 39 pancreas, 3 intestine), and 5693 patients received an HCT (3519 autologous, 2114 allogeneic, 60 unspecified type). Among SOT patients, 360 developed an IFD (incidence: 21.0 [per 1000 person-years]). Mold infections had the highest incidence (7.1), followed by unspecified mycoses (3.9) and endemic mycoses (3.3). Among HCT patients, 292 developed an IFD (incidence: 28.5), with higher incidence among allogeneic (58.4) versus autologous (12.8) HCT recipients; among all HCT recipients, unspecified mycoses had the highest incidence (8.3), then pneumocystosis (7.6), and mold infections (6.7). Median time to IFD was 173.5 days for SOT recipients and 197.5 days for HCT recipients. IFD risk varied substantially by transplant type, region, and certain underlying conditions. CONCLUSION: Our results suggest that IFDs remain an important cause of infection among SOT and HCT recipients, particularly later in the posttransplant period, and highlight the need for prevention strategies.

Histoplasmosis is a fungal infection that primarily affects the lungs. The condition is caused by Histoplasma organisms, which are often found in soil contaminated with bird or bat droppings. On January 17, 2025, a Georgia infectious disease physician notified CDC of suspected histoplasmosis cases among 12 members of an extended family from households in Georgia, Texas, and Washington. The ill family members included six adults aged 42-49 years and six children aged 8-16 years. They had recently returned from Costa Rica, where they toured a cave linked to a previous histoplasmosis outbreak (1).

Norovirus is attributed to nearly 1 out of every 5 episodes of diarrheal disease globally and is estimated to cause approximately 200,000 deaths annually worldwide, with 70,000 or more among children in developing countries. Noroviruses remain a leading cause of sporadic disease and outbreaks of acute gastroenteritis even in industrialized settings, highlighting that improved hygiene and sanitation alone may not be fully effective in controlling norovirus. Strengths in global progress towards a Norovirus vaccine include a diverse though not deep pipeline which includes multiple approaches, including some with proven technology platforms (e.g., VLP-based HPV vaccines). However, several gaps in knowledge persist, including a fulsome mechanistic understanding of how the virus attaches to human host cells, internalizes, and induces disease. © 2023 The Author(s)