Glossary terms with Z Breadcrumb Home Glossary Glossary A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Z Zika virus The Zika virus is a flavivirus that is primarily transmitted by mosquitoes of the genus Aedes. Infection often causes no symptoms or results in a mild febrile illness. Zoonosis A zoonosis is an infectious disease caused by a pathogen that can be naturally transmitted between vertebrates and humans.