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Salmonella Paratyphi B and Java are biovars of common serotype 1,4,[5], 12:b:1,2 which respectively cause human paratyphoid fever and gastroenteritis. The d-tartrate fermenting variant S. enterica subspecies enterica serovar Paratyphi B dT+ (formerly called and referred to in this report as S. Java) is thought to be less virulent to humans than the non d-tartrate fermenting variant, although cases of invasive infection have been reported.
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Denny et al. (2007) studied this question.