o Shoet History of Infectious Anemia. 



for the same reason as mentioned above. But inferring 

 from what has been learned from frequent visits of the 

 commissioners to the infected regions, losses are not 

 heavy at any place in the first year of outbreak. From 

 the second year on the patients gradually increase in 

 number. Tremendous losses follow for some years. A 

 great majority of the horses succumb to the disease. 

 Then slowly it is abated. 



Any district once affected seems to retain the disease 

 for a considerable number of years. An instance in the 

 province of Hidaka will illustrate this. Five or six years 

 after the initial outbreak in a small village, Horoizumi, 

 Urakawa Branch of Hokkaido-cho (the entire province 

 of Hidaka is under the control of this office) they began 

 to keep statistics of horses dying of the disease. 



From this table it will be seen that even more than 

 ten years after the initial outbreak cases are still found. 



The following will show that if proper preventive 

 methods be applied, the damage occasioned by the disease 

 will be considerably reduced, even if it is not possible to 

 check it out of the district at once. In July 1911 it was 

 reported that many horses were affected by the disease 

 in a part of Sekimoto village, Taga Country, Ibaraki 

 Prefecture, and our careful investigation revealed that 

 the virus was imported from a neighboring pasture of 

 the prefecture of Fukushima, where a great many horses 

 had already succumbed to it. We soon came to the 

 conclusion that this was an excellent place to carry 



