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10 Cards in this Set
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- Back
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Protozoa
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unicellular
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• Helminths
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multicellular worms
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Sarcodina
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amoebas use pseudopodia
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Mastigophora
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flagellates
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Apicomplexa (sporozoa) -
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Apicomplexa (sporozoa) - non-motile
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Life cycle
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2 major stages
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• Trophozoite
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actively motile form
– active, multiplying and invasive |
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Cyst
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usually quiescent form
– resistant to environment – usually infectious form |
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Naegleria fowleri
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Free living in
stagnate or standing water and soil • Humans accidentally infected with trophozoite |
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Primary amoebic meningoencephalitis (PAM)
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• Healthy persons
• Entry nasal mucosa (injected during swim) – Travels olfactory nerve, to meninges and brain hemorrage, necrosis – Coma, death expected 10 d after infection, 95% mortality • Treatment - immediate intrathecal Amphotericin |
