Presentation on theme: "What affects almost 5 billion people worldwide, kills more than 20 million people every year (many of them children), and costs governments billions of."— Presentation transcript:
What affects almost 5 billion people worldwide, kills more than 20 million people every year (many of them children), and costs governments billions of dollars annually in lost productivity, crops, and livestock?
Review Symbiosis: a close association between members of two species. No benefit or damage is indicated by this term. Symbiont: an organism involved in a symbiotic relationship
Parasitism Parasitism: A symbiotic relationship in which one species, the parasite, is dependent on the other species, the host, for its survival and causes harm to the host.
Parasite Parasite: An organism that lives in close association with a host for part or all of its life cycle and is dependent upon the host for nutrients, developmental cues, shelter, or other elements.
Host Host: an organism that harbors a parasite and is harmed by the parasite’s presence. Harm may be in the form of lost nutrients, physical damage to tissues, or a severe immune response to the parasite.