Paper II — 2015 September (Supplementary) (2010 Scheme) — Q13

Paper II

2015 September (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Name four parasites causing water borne diseases.

Q132 marksShort Notes★✓

Answer

Four parasites causing water-borne diseases:

1. Giardia lamblia — causes giardiasis, transmitted via ingestion of the resistant cyst form in contaminated water (notably resistant to standard chlorination).
2. Cryptosporidium parvum — causes cryptosporidiosis, watery diarrhoea, particularly severe in AIDS patients; oocysts are highly resistant to chlorination.
3. Entamoeba histolytica — causes amoebic dysentery/amoebiasis, transmitted via ingestion of cysts in contaminated water/food.
4. Dracunculus medinensis — causes dracunculiasis (Guinea worm disease), transmitted via drinking water containing infected Cyclops (copepod intermediate host).

(Other valid examples: Fasciolopsis buski, transmitted via contaminated water plants; Balantidium coli.)

Related Concepts

1. 1Giardiasis

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5. 5Giardiasis2018 February (2010 Scheme)Short Note · 2 marks