What is the difference between the West Nile virus and malaria?
West Nile is a virus; malaria is caused by a parasite. West Nile virus most severely affects people over the age of 50. Malaria is most severe in children and pregnant women; a bite from a mosquito that has fed on the blood of an infected bird spreads the West Nile virus. Malaria is spread by a female, night-biting Anopheles mosquito infected with the Plasmodium parasite.