Giardiasis - → consumed by animals → hatch → larvae encyst in muscles(meat Hookworm infections Necator americanus Life Cycle Eggs passed in

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Giardiasis - Giardia intestinalis Protozoan - flagellated Transmission: Fecal-oral route - ingest cysts in food, water. Disease: Cysts release trophozoites small intestine attaches to wall (adhesive disc) inflammation, diarrhea, blocks absorption of nutrients. Becoming more common in U.S. lakes, etc. Amoebic Dysentery - Entamoeba histolytica Protozoan - amoeba Transmission: Fecal-oral - ingestion of cysts in food, water Disease: Cysts trophozoites intestinal tract invade mucosa ulceration severe diarrhea, abdominal pain, etc. Tapeworm infections - Taenia saginata - beef tape worm, Taenia solium - pork tape worm. Life cycle: Ingest cysts in raw, poorly cooked meat release larvae intestine develop into adult worms. Embeds scolex in intestinal wall increases in length proglottids absorb nutrients leading to malnutrition. Proglottids, eggs deposited in soil
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Unformatted text preview: → consumed by animals → hatch → larvae encyst in muscles (meat). Hookworm infections - Necator americanus Life Cycle: Eggs passed in feces → hatch in moist soil → free living larvae → burrow thru skin feet, legs → blood vessels → lungs → coughed up, swallowed → intestine → mature into adults → burrow head into intestinal wall - feed on blood. Causes abdominal pain, loss appetite, protein and iron deficiencies (anemia). Pinworms - Enterobius vermicularis Life Cycle: Eggs ingested, inhaled → hatch in small intestine → mature and reproduce in large intestine - male & female mate → gravid females migrate to perianal region during night to deposit eggs on skin. Causes itching, irritation in area. Eggs easily spread to family members - all are treated. Reinfections common....
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This note was uploaded on 01/23/2012 for the course MCB MCB2010 taught by Professor Smith during the Fall '09 term at Broward College.

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