West Nile Virus Bulletin #1 Manitoba Health, Seniors and Long-Term Care has issued a ministerial order under the Environment Act to spray for adult mosquitoes with DeltaGard 20EW in affected communities due to risk of exposure to West Nile virus. High temperatures across southern Manitoba have shortened the time required for West Nile virus to develop within infected Culex tarsalis mosquitoes and be transmitted to humans. The province is currently in the highest-risk period for human exposure, w