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Parasites (Ectoparasites (Mites > Scabies
arachnid
burrow under skin…
Parasites
Ectoparasites
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Lice
3 pairs of legs
Head, Body and pubic (rounder and thick claws)
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Endoparasites
Eukaryotic, no cell wall
Protozoa
Motility:
Amoebas - pseudopodia
flagellates - flagellates (ATP)
Apicomplexans - (obligate intracellular / complex) - glide
Fecal/Oral transmission:
Cysts (more durable)
Trophozoites (delicate, motile)
Flatworms
Trematodes / Flukes
Complex life cycle (involves snail) + water transmission to humans
sexed or hemaphrodite
infect: GI, liver, lung, blood
Cestodes / tapeworms
Segments: Scolex, neck, strobilla (many proglottids)
intermidate host - eggs hatch and larvae bore out of GI > serious disease (cysticercosis)
definitive host: larvae > tapeworms
Roundworms / Nematodes
Final larvae stage (filariform) = invasive, penetrate skin
infection occurs by 1) ingestion eggs/larvae > GI worms 2) skin penetration (flariform > GI worms) 3)deposition from moz/fly bite > tissue worms
Tissue nematodes (bug bite) live in lympathics/tissue > blockage > elephatiasis
Terminology
Host reservoir: maintains parasite (possible source of infection)
Essential Host Reservoir: parasite cannot exist without
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