Mosquitos are a member of nematocerid flies. Mosquitos are blood sucking pests and carry many deadly diseases. There are several types of mosquitos. They say mosquitos can transfer up to 700 million dieseases.
Most scientific research has found that mosquitos are attracted to certain people, but this is mostly based on surface compounds found on the skin and outer layers of the skin, not the blood. Mosquitos do not avoid certain blood types.