What to know
To prevent West Nile virus infections, it is important to conduct surveillance and understand where and how much West Nile virus (WNV) activity is occurring in the United States. Below are several links to WNV Surveillance Guidelines and several reports describing WNV human activity in the United States.

Surveillance, Prevention, and Control
West Nile surveillance and control guidelines for professionals working to protect public health.
Publications
Morbidity and Mortality Weekly Reports (MMWR)
MMWR. Morbidity and Mortality Weekly Report / Vol. 72 / No. 34 / P. 901–906
MMWR. Morbidity and Mortality Weekly Report / Vol. 71 / No. 18 / P. 628–632
MMWR. Morbidity and Mortality Weekly Report / Vol. 70 / No. 32 / P. 1069–1074
MMWR. Morbidity and Mortality Weekly Report / Vol. 68 / No. 31 / P. 673–678
MMWR. Surveillance Summaries / Vol. 70 / No. 1 / P. 1–15

