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Volume 31, Number 5—May 2025
Research

Powassan and Eastern Equine Encephalitis Virus Seroprevalence in Endemic Areas, United States, 2019–2020

Hannah Padda, Claire Y.-H. Huang, Kacie Grimm, Brad J. Biggerstaff, Jeremy P. Ledermann, Janae Raetz, Karen Boroughs, Eric C. Mossel, Stacey W. Martin, Jennifer A. Lehman, Rebecca L. Townsend, David Krysztof, Paula Saá, Emily T.N. Dinh, Mary Grace Stobierski, Brenda Esponda-Morrison, Karen Ann A. Wolujewicz, Matthew Osborne, Catherine M. Brown, Brandi Hopkins, Elizabeth K. Schiffman, Alex Garvin, Xia Lee, Rebecca A. Osborn, Ryan J. Wozniak, Aaron C. Brault, Sridhar V. Basavaraju, Susan L. Stramer, J. Erin Staples, and Carolyn V. GouldComments to Author 
Author affiliation: Author affiliations: Centers for Disease Control and Prevention, Fort Collins, Colorado, USA (H. Padda, C.Y.-H. Huang, B.J. Biggerstaff, J.P. Ledermann, J. Raetz, K. Boroughs, E.C. Mossel, S.W. Martin, J.A. Lehman, A.C. Brault, J.E. Staples, C.V. Gould); American Red Cross, Rockville, Maryland, USA (K. Grimm, R.L. Townsend, D. Krysztof, P. Saá); Michigan Department of Health and Human Services, Lansing, Michigan, USA (E.T.N. Dinh, M.G. Stobierski); Connecticut Department of Public Health, Hartford, Connecticut, USA (B. Esponda-Morrison, K.A.A. Wolujewicz); Massachusetts Department of Public Health, Boston, Massachusetts, USA (M. Osborne, C.M. Brown, B. Hopkins); Minnesota Department of Health, Saint Paul, Minnesota, USA (E.K. Schiffman, A. Garvin); Wisconsin Department of Health Services, Madison, Wisconsin, USA (X. Lee, R.A. Osborn, R.J. Wozniak); Centers for Disease Control and Prevention, Atlanta, Georgia, USA (S.V. Basavaraju); Infectious Disease Consultant, North Potomac, Maryland, USA (S.L. Stramer)

Main Article

Table 3

Blood donor and estimated population seroprevalence for Eastern equine encephalitis virus in selected counties in study of Powassan virus and Eastern equine encephalitis virus seroprevalence in endemic areas, United States, 2019–2020

State/county Calculated sample size No. samples tested No. (%) donors
Neutralizing antibody positive Neutralizing antibody and IgM positive % Seroprevalence (95% CI)
Estimated* Estimated recent†
Connecticut
New London
 17
 17
 0
 0
0 (0–19.5)
 0 (0–19.5)
Massachusetts
Bristol 36 36 0 0 0 (0–9.74) 0 (0–9.74)
Essex 49 49 0 0 0 (0–7.25) 0 (0–7.25)
Middlesex 100 100 0 0 0 (0–3.62) 0 (0–3.62)
Plymouth 32 32 0 0 0 (0–10.9) 0 (0–10.9)
Worcester
 52
 52
 1 (1.9)
 1 (1.9)
1.62 (0.04–8.75)
 1.62 (0.04–8.75)
Michigan
Berrien 81 81 0 0 0 (0–4.45) 0 (0–4.45)
Cass 27 24 0 0 0 (0–14.3) 0 (0–14.3)
Kalamazoo 137 137 0 0 0 (0–2.66) 0 (0–2.66)
Van Buren 39 39 0 0 0 (0–9.03) 0 (0–9.03)

*Neutralizing antibodies present. †Neutralizing antibodies and IgM present.

Main Article

Page created: March 18, 2025
Page updated: April 25, 2025
Page reviewed: April 25, 2025
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