5i8 



FILTERABLE VIRUSES 



e.g., typhus fever and vaccinia, are either not filterable or filterable with the greatest 

 difficulty. Li the past all attempts to classify these diseases have been unsuccessful, 

 and there is every reason to believe that such attempts are still premature. 



TABLE I 



Filtepd±)lc Vipas DiscAses 



Bdctepioph Age 



Mosdic disedses of plants 

 (infectious chlorosis) 



Sacbpood 



Wilt of Europedn nun moth 

 Wilt of gypsy moth caterpilldP 

 Jaundice of silK worms 



Epizootic of guinea pigs 

 Hog cholera 



Cattle plague (Rinderpest) 

 Pernicious anemia of horses 

 Vipus ni infection of patbits 

 Foot-and-mouth disease 



1 Type A 



2 Type 



Ve&iculap stomatitis of horses 

 PaPavaccinia (No pcport on f iltp^tion) 



Swine-pox 

 Goat -pox 

 Sheep-pox 

 Hopsc-pox 

 Cow-pox } - 

 Smallpox 

 Vapioloid 

 AldstPiro 



^ r Chicken-pox "l^^o reports 

 ]_ r HeppGS zosterjon fiUtviiion 

 |_ [Symptomatic hcppes 

 6JEnccphdJ.itis 

 [_]. Lethargic 



2 Tollowing vaccination"}- 



3 Japanese 19241 _^ 



4 Kopitschonep_J 

 _ I 5 Australian X disease 



[Poliomyelitis 



Rabies 



Bopna's disease 



Fowl plague and plague of blackbirds 

 Guinea pig papalysis 

 Distempep of dogs 



Tpachoma and inclusion blenopphea 



Infectious papular stomatitis of cattle 



Molluscum contagiosum 



Warts 



Contagious epithelioma (fowl-pox) 



1 Chickens 



2Pigeons 

 Infectious myxomatosis of rabbits 

 Rous sapcoma of chickens 

 Leukemia of chickens 

 Lymphocystic disease of fishl 



Epithelioma offish ? No reports on filtration 



Capp-pox _J 



Humps (According to Kepmorgdint, a spirochetal dibease) 

 Agalactia (Accofding toBridpe.a bacterial disease) 

 Salivapy gland disease of guinea pigs 



Measles (rubeola) 



German measles (pubella) (No pepopt on filtration) 



Gpippe (influenza) (According to Olitsky and Gates a 

 Common colds bactepial disease) 



Naipobi disease of sheep 

 Catarphal fever (blue tongue) of sheep 

 Afpican hopsc sickness 

 Pappataci fevep 

 Dengue fever 



_yellow fevep (According toNoguchi a 

 spipochetai disease) 



Typhus fevep 

 Tpench fevep 



Rocky Mountain spotted fevep 

 HeaPtwatep disease 

 _Flood fevep of Japan 



I +j 'O, 



To gr~Opoya fevcp and veppuga pepuviana 

 J. 'I S] Pleupopneumonia 

 u n| Avian diphtheria 

 fQ'«[_Scaplet fevep 



Majority of ttie diseases which have been placed in the 

 filterable virus gpoup by different wopkeps. 



The diseases listed do not form a homogeneous group and some of them should be 

 omitted. The evidence that "epizootic of guinea pigs" is a virus disease is not con- 

 vincing. There is considerable doubt as to how long the insect-borne diseases will re- 

 main on the list. Most observers no longer consider scarlet fever a virus disease. 

 M'Fadyean,' as early as 1908, suggested that pleuropneumonia be classified with 



M'l'adyean, J.: ./. Camp. Palli. Cj^ Thcrapx, 21, 58, 168, 



1 90S. 



