142 INFECTIOUS DISEASES DUE TO PROTOZOA 



Table XLII. — Mal de Caderas (Experimental Horse No. 3 Sivori and 



Lecler) 



Date 



16-VIII 

 17 VIII 

 18-VIII 

 19-VIII 

 20-VIII 

 22-VIII 

 24-VIII 

 1-IX 

 6-IX 

 8-IX 

 15-IX 

 10-X 

 14-X 

 19-X 

 25-X 

 4-XI 

 17-XI 

 22-XI 



Trypanosom.es 



2-3 per field, first seen. 

 2-3 per field. 

 2-3 per field, 

 none observed, 

 none observed, 

 none observed. 

 1 per field, 

 none observed. 

 1 to 2-3 fields. 

 5-10 per field. 

 10-20 per field. 

 1-2 per field, 

 none observed, 

 none observed. 

 5-10 per field. 

 5-10 per field, died. 



GAMBIAN HORSE SICKNESS 



Horses are affected naturally; horses, rats, mice, guinea pigs, 



rabbits, dogs, cattle and goats may 

 be given the disease by inoculation. 

 Trypanosoma dimorphon was 

 found by Dutton and Todd in three 

 forms: (1) in the beginning of the 

 disease small forms 11-13 by 0.8-1 fx, 

 with very small undulating mem- 

 brane, short flagellum and blunt pos- 

 terior end; (2) long form 26-30 by 

 1.6-2 fx, with very long flagellum; 

 (3) "stumpy form" 16-19 by 3.4- 

 3.5 jm, with short thick body and 

 very long flagellum. Transitional 

 forms between these occur. The 

 long form (2) is very numerous during the last stages of I lie dis- 

 ease. Laveran and Mesnil did not find the "stumpy form" 



Fig. 21. Trypanosoma dimor- 



phon (Laveran and Mesnil). 



