Factsheet der WHO zu West-Nil-Fieber (in Englisch) West Nile Virus World Health Organization World Health Organization: West Nile Virus http://www.who.int/mediacentre/factsheets/fs354/en/ West nile virus World Health Organization World Health Organization: West Nile Virus West Nile virus World Health Organization: West Nile Virus West Nile, World Health Organization website Per the World Health Organization West Nile, World Health Organization: West Nile Virus West Nile Virus Fact Sheet "West Nile virus" http://www.who.int/mediacentre/factsheets/fs354/en/ West nile virus World Health Organization WHO World Health Organization website West Nile Virus Factsheet der WHO zu West-Nil-Fieber (in Englisch) West Nile Virus West Nile Virus