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Volume 32, Number 9—September 2026

Research Letter

Powassan Virus in Ixodes scapularis Tick Populations, Illinois, USA, 2025

Aurora Marguccio, Lance E. Jones, Brian Wilm, Arif Ciloglu, Valeria Trivellone, Millon Blackshear, Tomas Rodriguez, April Holmes, Samantha Kerr, Chang-Hyun Kim, and Chris M. StoneComments to Author 
Author affiliation: Prairie Research Institute, University of Illinois Urbana-Champaign, Champaign, Illinois, USA (A. Marguccio, L.E. Jones, B. Wilm, A. Ciloglu, V. Trivellone, M. Blackshear, T. Rodriguez, C.-H. Kim, C.M. Stone); Faculty of Veterinary Medicine, Erciyes University, Kayseri, Türkiye (A. Ciloglu); Illinois Department of Public Health, Springfield, Illinois, USA (A. Holmes, S. Kerr)

Main Article

Figure 2

Maximum-likelihood phylogenetic tree of Powassan 3′ untranslated region created for study of Powassan virus in Ixodes scapularis tick populations, Illinois, USA, 2025. Branch lengths estimated using Hasegawa-Kishino-Yano substitution model with a gamma-distributed rate variation across 4 site categories. Bootstrap values >80% (1,000 replicates) are shown. Orange squares indicate samples from this study, clustering within lineage II together with samples previously detected in Wisconsin, USA. CAN, Canada; RUS, Russia.

Figure 2. Maximum-likelihood phylogenetic tree of Powassan 3′ untranslated region created for study of Powassan virus in Ixodes scapularis tick populations, Illinois, USA, 2025. Branch lengths estimated using Hasegawa-Kishino-Yano substitution model with a gamma-distributed rate variation across 4 site categories. Bootstrap values >80% (1,000 replicates) are shown. Orange squares indicate samples from this study, clustering within lineage II together with samples previously detected in Wisconsin, USA. CAN, Canada; RUS, Russia.

Main Article

Page created: July 21, 2026
Page updated: August 17, 2026
Page reviewed: August 17, 2026
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