Sunday, 27 January 2008

Protozoa pathogens – post 2 (Eunice)

Plasmodium species [1]

(Picture taken from http://en.wikipedia.org> malaria parasite> plasmodium falciparum)

Characteristics: In P. falciparum, only early trophozoites and gametocytes are seen in the peripheral blood. The parasitised RBCs are not enlarged and it is common to see multiple infected RBCs.


Toxoplasma species [2]

(Picture taken from http://en.wikipedia.org> toxoplasma)

Characteristics: Tachyzoites are the motile, asexually reproducing form of the parasite.


Helminths – Wuchereria bancrofti [3]
(Picture taken from http://en.wikipedia.org> helminths> wuchereria bancrofti)

Characteristics: The microfilaria is sheathed and the tail is tapered to a point. The nuclear column loosely packed, the cells can be visualized individually and do not extend to the tip of the tail.


Leishmania species [4]

(Picture taken from http://google.com> images> leishmania)

Characteristics: Leishmania cells have two morphological forms: promastigote (with an anterior flagellum) in the insect host, and amastigote (without flagella) in the vertebrate host.

Gardia, Cryptosporidium and Cyclospora [5]
Image of Gardia:
(Picture taken from http://en.wikipedia.org> gardia)

Image of Cryptosporidium
(Picture taken from http://en.wikipedia.org> cryptosporidium)

Image of Cyclospora
(Picture taken from http://en.wikipedia.org> Cyclospora)

REFERENCES
1) http://en.wikipedia.org> malaria parasite
2) http://en.wikipedia.org> toxoplasmosis
3) http://en.wikipedia.org> helminths> wuchereria bancrofti
4) http://en.wikipedia.org> leishmania
5) Foodborne pathogens: hazard, risk analysis and control / edited by Clive de W. Blackburn and Peter J. McClure

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