Relationship Between Hog Cholera Virus and Virus Diarrhea Virus of Cattle.

Abstract
Pigs inoculated with VD (Virus diarrhea) virus survived inoculations of virulent HC (hog cholera) virus that killed littermates that had not received VD virus. Survival was signalized by accelerated antibody production both to HC and VD viruses. In reciprocal tests, HC virus produced secondary response in calves. Reciprocal neutralization tests between VD virus and HC virus showed they did not share a common antibody. Protection appeared related to accelerated antibody production that resembled the secondary response induced by inactivated viral antigen.