DOVER, DE (Sept. 12, 2023) – The Delaware Public Health Laboratory (DPHL) has identified this year’s first human cases of West Nile Virus (WNV) in three men 50 years of age and older, all of whom reside in New Castle County. All three individuals who contracted WNV were hospitalized due to infection from the mosquito-borne illness. At this time, it appears that each WNV victim is likely to have contracted the disease locally, but a public health investigation is ongoing, the Delaware Division of Public Health (DPH) announced today.