249 

 DIVISION OF ANIMAL INDUSTRY 



Honolulu, July 31, 1913. 



Hon. W. ^l. Gififard, President and Executive Officer, Board of 

 Agriculture and Forestry. 



Sir : — I beg to report on the work of the Division of Animal 

 Industry for the month of July as follows : 



Hog Cholera. 



The suggestion contained in my report for last month in re- 

 gard to the origin of the recent epidemic of virulent hog cholera 

 on the Island of Oahu, and to the effect that the outbreak is due 

 to a recrudescence of the mild chronic form of the disease which 

 has been known here for years, seems to be confirmed by the fact 

 that no complaint has reached this office of imported hogs being 

 sick or developing the disease after arrival here, nor has it been 

 possible to trace the disease to any of the recent importations of 

 hogs, which have, besides, been few and far between. 



The Board's decision to promulgate a regulation to prevent 

 the spread of the disease to the other islands took form with the 

 approval by the Governor of Rule and Regulation No. VII of the 

 Division of Animal Industry on July 10, 1913. 



Although no hogs have been shipped from Oahu since that 

 time the disease has nevertheless made its appearance on Kauai 

 in the Koloa district, from where the deputy Territorial veteri- 

 narian reports the death of a number of hogs including most of 

 those belonging to the Koloa Sugar Company. He suggests that 

 the disease was brought there with a couple of hogs shipped 

 from Honolulu several weeks ago, but inquiry made at the freight 

 office of the Inter-Island Steam Navigation Company shows that 

 no hogs were shipped to Kauai since the month of May when 

 six pigs were sent from the Waialae Ranch to Mr. Walter Mc- 

 Bryde, from either of which places no disease has been reported. 

 It would therefore seem likely that the outbreak on Kauai might 

 be of the same nature as that on Oahu, that is a recrudescence or 

 reinforcement of the attenuated virus, the continued presence of 

 which cannot be doubted, even though the mild form the disease 

 had attained made it fatal only to young pigs whose natural 

 resistance had been impaired or weakened by other diseases or 

 unfavorable surroundings and conditions, all tending to obscure 

 the true nature of the disease. Rule IV of this Division, pertain- 

 ing to the importation of hogs from the mainland of the United 

 States, has proved effective in keeping out hog cholera ever since 

 it went into eft'ect several years ago, previous to which time the 

 arrival of cholera hogs was of frequent occurrence ; and so long 



