Parasites are the organisms that live in a symbiotic relationship with other organisms. The organism on or inside which the parasite lives is known as the host. The size of a parasite can vary from microscopic to large enough to be seen with naked eyes. Parasites survive by feeding from the host. Giardia infection, Chagas disease and tapeworm are some of the examples of parasitic infections. The signs of parasitic infections depend on the parasite. Symptoms of giardiasis are diarrhea, nausea, abdominal cramping and bloating, fatigue and weight loss. People having Chagas disease may not develop symptoms for few weeks. Its symptoms are low fever, skin rash, nausea and vomiting, diarrhea, etc. The topics covered in this extensive book deal with the core subjects of parasitic infections. It provides significant information of this discipline to help develop a good understanding of the prevention and treatment of parasitic infections. A number of latest researches have been included to keep the readers up-to-date with the global concepts in this area of study.