West Nile virus leads domestic arboviral diseases in 2018 US surveillance report

This surveillance report describes the epidemiology of West Nile virus and other domestic nationally notifiable arboviral diseases in the United States during 2018. The report covers the entire US population, though specific sample sizes, interventions, comparators, and clinical outcomes were not reported.

The main findings indicate West Nile virus was the leading cause of domestically acquired arboviral disease in the continental United States. Additionally, approximately 93% of arboviral disease cases in 2018 occurred during the months of April through September. No effect sizes, absolute numbers, p-values, or confidence intervals were provided for these observations.

Safety, tolerability, and adverse event data were not reported. The report contains no stated limitations, and funding or conflicts of interest information was not provided. As a descriptive surveillance report, it establishes epidemiological patterns but does not assess causality, interventions, or clinical outcomes. Its practice relevance is limited to informing public health and clinician awareness of seasonal disease patterns.