Very small particles visible only with an electronic microscope. Considered to be complex molecules and not living organisms, these are often causes of disease in plants, animals, and bacteria.
Manual listing field procedures for bird specimen collecting, bacterial, fungal, parasitic, and viral diseases, biotoxins, chemical toxins, common and scientific names of birds, and glossary. Manual can be downloaded or viewed in PDF format.
National Wildlife Health Center study of the West Nile Virus to learn the current geographic extent, to understand how the virus moves between birds, mosquitoes, and humans, and to predict future movements of the virus.
Map showing which states are positive for West Nile Virus. Clicking on state outline links to state West Nile Virus or public health website. Site also has links to other West Nile Virus maps.
Informational site provides links to data, news updates, information, and maps related to outbreaks of the West Nile virus and mosquito-borne encephalitis in the United States.