subphylum mastigophora
TRANSCRIPT
simple, single-celled animals
very small, body elongate, leaf-like appearance
flagellum arises posteriorly and can be connected to other parts of body
Flagellates include:
1. Blood flagellates
2. Intestinal flagellates
3. Vaginal flagellates
Blood flagellates
Leishmania tropica
Cutaneous leishmaniasis
LEISHMANIA BRAZILIENSIS Amastigote and promastigote forms Shape: Oval Vector: mosquito Animal source: small rodent
animals.
Leishmania donovani
Trypanosoma
Cyclical transmission :The arthropod is necessary intermediate host in which the Trypanosoma multiply .
Non –cyclical transmission (interrupted feeding of biting insects) . The try do not multiply and die quickly so cross transmission is only possible for a few hours .
Salivarian Species T. brucei affects all domestic mammals
including small and farm species and humans. It also causes a specific skin disease in donkeys.
T. vivax infects ruminants, horses and camels causing significant disease.
T. equiperdum causes venereal equine disease dourine. It is the only trypanosome that does not immediately require an insect vector for transmission, being spread through coitus.
T. simiae causes fatal pyrexia in pigs while T. congolense is milder in the same species.
T. congolense can also affect dogs and cats causing acute fever, anaemia and neurological signs.
T. evansi also affects all domestic mammals.
Stercorarian Species
T. cruzi occurs in South America where it is transmitted by a triatomid (kissing) bug and infects armadillos, possums and humans.
It is known as Chagas’ Disease. A similar acute disease is thought to be caused by T. cruzi in dogs in the USA.
T. melophagum and T. theileri are non-pathogenic species present in the UK infecting cattle, buffalo and antelope. Stress and concurrent disease are thought to be contributors to the development of clinical disease from T. theileri.
Intestinal flagellates
Giardia lamblia -the only pathogenic intestinal
flagellates affecting the small intestine of man especially the children from 6-10 years old.
-it is known to cause epidemic, endemic or traveler’s diarrhea through the world.
•It is pear-shaped•bilaterally symmetrical•about 15x8um•convex dorsally & flat ventrally with 2 suction discs containing two oval nuclei • 2 longitudinal axostyles crossed by 2 parabasal bodies & 4 pairs of flagella.
•ovoid•about 12 x 8 µm• has a well defined cyst wall.•It has a granular cytoplasm containing 4 nuclei at one pole, axostyles, parabasal bodies and remnants of flagella.
Genitourinary flagellate
Trichomonas vaginalis-- exists only as a trophozoite stage.