16 



Sir D. Bruce and others. Trypanosome 

 Table XIV — continued. 



Date. 



No. of 

 expt. 



Source of virus. 



Period of 

 incubation, 

 in days. 



Duration 

 of disease, 

 in days.* 



Remarks. 



Guinea-pigs. 



1912. 





Feb. 



14... 



221 



>y 

 )> 



14... 



222 



16... 



229 



jj 



16... 



230 



Feb. 



14... 



224 





16... 



231 





16... 



232 



May 



4... 



508 





4... 



509 



From Cow 103 

 103 



From Dog 16 . . . 



16 ... 



Rats. 



From Cow 103 

 From Dog 16 .. 



16 .. 



From Cow 103 

 103 



Never showed trypanosomes. 



Never showed trypanosomes. 



* Duration includes the days of incubation; it dates from day of infection. 



Disease set up in Various Animals by Trypanosoma pecorum, Nyasaland — 



The Mvera Cattle Strain. 



Donkeys. — When the Commission arrived at Kasu in January, 1912, the 

 neighbouring Mvera Mission Station owned a herd of 16 donkeys. On 

 examining them five were found to be infected with T. pecorum. One died 

 after 87 days ; the other four are at present free from trypanosomes and 

 apparently in good health. It is true that three of the apparently recovered 

 animals were given arsenic for some months, but the fourth, which got 

 none, did equally well. It may also be noted that two of the four have 

 recently given birth to healthy foals. Susceptible animals inoculated with 

 the blood of the four donkeys remained healthy. From this it would 

 appear that this strain of T. pecorum is not very fatal to donkeys. 



Cattle. — A year ago the Mvera herd consisted of 50 head of cattle, and of 

 these 16 were found to be infected with T. pecorum. At the present date 

 10 of these have died of this disease and six remain alive. The six have 

 shown trypanosomes in their blood for some months, and their blood 

 inoculated into healthy dogs has proved non-infective. In spite of this, 

 however, these cattle remain in poor condition : thin, with rough, staring 

 coats, and every appearance of suffering from a chronic disease, and it 

 seems highly probable that more of them, if not all, will succumb to the 

 effects of the trypanosome. Three oxen (Experiments 226, 227, and 228), 

 which were inoculated from a dog whose blood contained T. pecorum, at 

 the present date appear quite healthy and have apparently recovered. 



Goats. — The Mvera Cattle strain is fatal to goats, killing them, as a rule, 



