Nematode parasites -- Pathophysiology of nematode infections -- Epidemiology of gastrointestinal nematodes in grazing ruminants -- The principles of gastrointestinal nematode control -- Anthelmintics -- Anthelmintic resistance -- Drenching and resistance -- Worm control and resistance management -- "Non-chemical" control options -- Nutrition and parasitism -- Animal genetics and parasitism -- The immune response to parasites.