Aedes aegypti

Chikungunya virus explained: how this mosquito-borne alphavirus spreads, why it causes lasting joint pain, how it differs from dengue, and what vaccines exist.

How yellow fever virus moves from monkeys to cities, why it attacks the liver, and how the 17D vaccine, a single dose, gives lifelong protection.

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.