The world’s deadliest animal is back in the limelight. In 1999-2000 we first learned of West Nile Virus. In 2013-2014 it was Chikungunya, in 2015-2016 it is Zika virus. No animal, including humans, kills more people in a year. 2.7 million people die annually from malaria alone, according to the World Health Organization.