Medical Microbiology

Trypanosoma 487

Trypanosomagambienseandrhodesiense:LifeCycle

In Glossina flies In human blood

Salivary gland

Intestine

1

2

3

4

5

6

7

8

9

10

11

12

Fig.9. 6 Humanblood: 1 trypomastigote,slenderformwithvariantspecific

surfaceantigen(VSSA); 2 binaryfissionform;3, 4 slenderformswithother

VSSAtype; 5 short(“stumpy”)form.

Glossinaintestine: 6 – 8 procyclicformswithoutVSSA(reproductionbylongi-

tudinalfission).

SalivaryglandofGlossina:9, 10 epimastigoteformsonepithelium; 11 trypo-

mastigoteformwithoutVSSA; 12 trypomastigoteformwithVSSA(metacyclic

form).(AccordingtoVickermanK,BarryJE,inKreierJP,BakerJR,eds.Parasitic

Protozoa,Vol.2,SanDiego:AcademicPress; 1 992: 9 4.)

9

Kayser, Medical Microbiology © 2005 Thieme