It is hard to get used to the idea of something living by drinking blood. Blood is a precious thing to us. Without it we don't live for very long. Unfortunately, some creatures need blood to survive. Ticks are one such creature.
Ticks also ingest whatever disease-causing microbe that happens to be in their blood meals.
Rocky Mountain spotted fever , Lyme disease and Ehrlichiosis are examples of diseases these nasty ticks can give to people. A recent study in the April 2001 issue of Journal of Clinical Microbiology has demonstrated that another microbe might be passed to humans by ticks. Most people get CSD from cat scratches and bites. This disease causes people to feel tired and have a low-grade fever and will grow in the lymph nodes causing them to swell. CSD can last from weeks to several months.