With outbreaks in Angola in 2015 and Brazil in 2016, and cases detected in French Guiana in 2017 and even recently in Asia, where the virus had never previously been witnessed, yellow fever – a sometimes fatal mosquito-borne disease – has once again become a global public health problem. After major outbreaks between the 17th and 19th centuries, it never disappeared and has continued to be rife in some world regions. WHO even believes that the impact of yellow fever is underestimated, suggesting that the real number of cases is 10 to 250 times higher than those currently notified.