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We have previously shown that, although bacterial endotoxins can sensitize mice to histamine, this effect is more feeble than, and qualitatively different from, that of the characteristic histamine-sensitizing factor (HSF) of pertussis vaccine (R. E. Pieroni, E. J. Broderick, and L. Levine, J. Bacteriol. 91:2169, 1966). HSF is a heat-sensitive, proteinaceous substance closely associated with, or identical to, the immunogen of pertussis vaccine (J. Munoz and B. M. Hestekin, Proc. Soc. Exptl. Biol. Med. 112:799, 1963; R. E. Pieroni, E. J. Broderick, and L. Levine, J. Immunol. 95:643, 1965; A. C. Wardlaw and C. M. Jakus, Can. J. Microbiol. 12:1105, 1966). A further characteristic of HSF is that its activity can be demonstrated in only certain strains of mice. It is well established, for example, that, whereas the CFW mouse strain displays a greatly increased sensitivity to histamine after pertussis vaccination, the CFI strain fails to respond (J. Munoz, p. 460, in M. Landy and W. Braun [ed.], Bacterial endotoxins, Rutgers Univ. Press, New Brunswick, N.J., 1964; R. E. Pieroni and L. Levine, J. Allergy 39:25, 1967). The natural sensitivity of these strains to histamine, however, is not markedly different (R. E. Pieroni and L. Levine, unpublished dcata). Since the responsive CFW strain was used in our earlier work on endotoxin-induced histamine sensitivity, we considered it of interest to determine the response of the CF1 mouse strain to histamine after injection of bacterial endotoxin. We also wished to determine whether host responsiveness to the intrinsic lethality of endotoxin played a major role in endotoxin-induced histamine sensitivity. Groups of 18 CFI and CFW mice (Carworth Farms, Inc., New City, N.Y.) were injected intraperitoneally (ip) with five graded doses of Salinionella typhosa 0901 endotoxin. The low dose consisted of 50,ug, increased by successive doubling to a high dose of 800 ,ug. Because of a handling error, the CFW group that received the highest endotoxin injection comprised 10 mice instead of the 18 assigned to the other 9 groups. Groups of 10 CFW and CFI mice were inoculated ip with 13 X 109 Bordetella pertussis organisms, and similar groups of 10 were set aside as uninoculated controls. The results shown in Table 1 indicate that mice of both strains showed a similar susceptibility to the lethal effect of typhoid endotoxin. Most of these deaths occurred within the first 48 hr after injection of endotoxin. There were no toxic deaths among the vaccine-injected mice. In 4 days, all of the surviving mice were challenged ip with 1 mg of histamine dihydrochloride (Nutritional Biochemicals Corp., Cleveland, Ohio). In contrast to the similar susceptibility of these strains to endotoxin lethality, the response of the survivors to histamine was quite different. None of the 58 CF1 mice available for challenge died, whereas 13 of the 62 CFW mice died in histamine shock. In confirmation of previous findings, pertussis sensitization showed a parallel strain contrast. All 10 CF1 mice survived the histamine in-

Mouse strain selectivity in the endotoxin-induced hypersensitivity to histamine