arbovirus

Rift Valley fever spreads by mosquitoes and contact with infected livestock, causing abortion storms in animals and rare severe disease in humans.

West Nile virus: mosquito transmission, bird reservoirs, neuroinvasive disease, the 1999 NYC outbreak, and why no human vaccine exists yet.

Zika virus explained: how it spreads, what it does in adults and in pregnancy, the 2015-2016 outbreak, and why no vaccine is licensed yet, per CDC and WHO.