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Recent studies reveal that the Rab GTPase Rab32 and its guanine nucleotide exchange factor BLOC-3 form a conserved pathway that both restricts Salmonella Typhi to human hosts and mediates its killing in macrophages of non-susceptible species. These proteins, previously recognized for their role in intracellular membrane trafficking—particularly in melanin synthesis through enzyme transport to melanosomes—are now identified as central players in innate immunity against typhoidal Salmonella. Following intestinal invasion, serovar Typhi effectively evades host defenses through multiple mechanisms: it avoids TLR4 recognition, escapes the classical complement pathway, and resists oxidative killing—primarily through production of its protective Vi capsular polysaccharide. 

Animal reservoir: Salmonella Typhi is a human-restricted serovar.

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