The Journal of Experimental Medicine
Janeway's Immunobiology 7th Edition
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The Journal of Experimental Medicine, Vol 89, 529-539, Copyright, 1949, by The Rockefeller Institute for Medical Research New York

ARTICLE

NUTRITION OF THE HOST AND NATURAL RESISTANCE TO INFECTION : IV. THE CAPABILITY OF THE DOUBLE STRAIN INOCULATION TEST TO REVEAL GENETICALLY DETERMINED DIFFERENCES IN NATURAL RESISTANCE TO INFECTION



Howard A. Schneider Ph.D.1

1 From the Laboratories of The Rockefeller Institute for Medical Research

The double strain inoculation (DSI) method of testing for natural resistance to infection has been examined in the instance of mouse salmonellosis. The DSI method has been found capable of detecting differences in natural resistance due to genetic as well as nutritional causes.

A difference in response to Salmonella infection was found for the first time between the two "susceptible" inbred mouse strains, BSVR and BSVS. Whereas BSVS mice for the most part survived an intraperitoneal injection of 103 "avirulent" S. typhimurium, BSVR mice all succumbed.

The relationship of the DSI test to the usual single infection test has been discussed and it is suggested that such single infection tests are special cases of the DSI test, since they involve a heterogeneous bacterial population which can be considered as a mixture of cultures of differing virulence and in which, by a single injection, the usual time interval between the two injections of the DSI method has been reduced to 0.

 Submitted on January 25, 1949


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