214 VETERINARY STUDIES 



This allows time for the disease to appear in case the new hogs 

 have come from infected herds, through infected stockyards, or 

 in infected cars. 



It is a mistake to visit your neighbor's hogpens, and walk 

 about among the hogs out of mere curiosity, when your neigh- 

 bor has told you that some peculiar sickness has appeared in 

 his herd. 



It is a mistake to allow the last one or two sick hogs, which 

 usually show a very chronic type of the disease, to linger for 

 months on the farm. It is a better policy to kill such hogs 

 promptly, and have done with the disease. They do not usually 

 become thrifty and profitable feeders for a long time after re- 

 covery. On the other hand, they may remain infectious to the 

 last period of their sickness, thus keeping the yards and pens 

 infected and furnishing a supply of infectious material for 

 future outbreaks. 



It is a criminal mistake to leave carcasses in gullies, or throw 

 carcasses into any stream, lake, or pond, or to bury them near 

 such body of water. 



Suggestion. — An outbreak of hog cholera may be quarantined 

 when it first appears; but it is extremely difficult to quarantine 

 the disease after it has been scattered over several townships. 

 Quarantine to be effective must be prompt and rigid ; partial or 

 imperfect quarantine is worse than useless. 



■Disinfection. — The virus may live for months, under favor- 

 able conditions. Sometimes the cheapest way to disinfect is to 

 burn old sheds and pens where the sick hogs have been con- 

 fined. But if these structures are valuable, other means of dis- 

 infection must be considered. Corrosive sublimate, dissolved 

 in water in the proportion of 7.5 grains to each pint, is a good 

 disinfectant ; or, whitewash that is made by adding fresh chlorid 

 of lime, one half pound to the gallon, may be used instead of the 

 corrosive sublimate solution. All bedding and loose stuff should 

 be burned or plowed under. The ground may be disinfected 

 by saturating the surface with corrosive sublimate solution, or 

 by burning off straw that has been scattered over the surface, 

 and the danger of infection may be lessened by plowing and 

 planting the infected area. 



