Typhoid fever bacteria collect on gallstones to perpetuate disease

A new study suggests that the bacteria that cause typhoid fever collect in tiny but persistent communities on gallstones, making the infection particularly hard to fight in so-called "carriers" -- people who have the disease but show no symptoms. Humans who harbor these bacterial communities in their gallbladders, even without symptoms, are able to infect others with active typhoid fever, especially in developing areas of the world with poor sanitation.

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