Which disease is not related to rodents in its transmission to humans?

Yellow fever is distinct in its transmission pathways and is not associated with rodents. Instead, it is primarily transmitted to humans through the bite of infected mosquitoes, specifically those in the genus Aedes and Haemagogus. This mosquito-borne virus is endemic to tropical areas of Africa and South America and does not have a zoonotic cycle involving rodents.

In contrast, the other listed diseases are indeed linked to rodents. Salmonellosis can be contracted from consuming food or water contaminated with the feces of infected rodents. Leptospirosis is caused by bacteria that are often found in the urine of infected animals, including rodents, which can contaminate water and soil. Rickettsial pox is transmitted by mites that may inhabit rodents, particularly house mice, establishing a clear connection between this disease and rodent populations. Understanding these transmission methods emphasizes the role of different vectors in disease ecology and public health.