A small mosquito is, at base, a harmless insect. The situation can change quickly if it is carrying the West Nile virus (WNV). WNV is from Uganda (Africa) and is found mainly in Quebec, in areas of the southwest of the province. The virus is transmitted by a single bite of an infected mosquito. However, it is not only the human being who is the target; various cases have also been reported in animals, including birds and horses.