Infettivologia
Ecologic Immunology of Avian Influenza (H5N1) in Migratory Birds
The claim that migratory birds are responsible for the long-distance spread of highly pathogenic avian influenza viruses of subtype H5N1 rests on the assumption that infected wild birds can remain asymptomatic and migrate long distances unhampered.
Approfondisci
http://www.cdc.gov/eid/content/13/8/pdfs/07-0319.pdf?s_cid=e...
Centers for Disease Control and Prevention