In New Zealand they are a bloodsucking nuisance, but in other parts of the world mosquitos spread serious disease - including the Zika virus, West Nile virus, dengue, and malaria. The Ministry of Health website states that Mosquitoes are responsible for more human deaths than any other living creature. UK based, medical entomologist at Keele University, Frederic Tripet is the co-author of a study recently published in the journal Scientific. The study has found that mossies have learned to avoid five common pesticides after a single non-lethal dose.