Tuberculosis, once the leading cause of death worldwide, has resurged in the form of multi-drug resistant strains, complicating treatment and turning a familiar disease into a modern pestilence. These historical events serve as stark reminders of the raw destructive capacity of a novel pathogen encountering a susceptible population.
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When bacteria evolve to withstand the drugs designed to kill them, standard treatments fail, turning minor infections into deadly pestilences. Dengue fever, often called "breakbone fever," causes severe pain and affects hundreds of millions of people annually.
This catastrophic event was caused by the bacterium Yersinia pestis , transmitted primarily by fleas living on black rats. When a pathogen jumps from a vertebrate animal to a human, it can create the perfect storm for a new pestilence.
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Methicillin-resistant Staphylococcus aureus (MRSA) causes difficult-to-treat infections in hospitals and communities. The Black Death, which swept through Europe in the 14th century, is the archetypal pestilence, killing an estimated 30% to 60% of the continent's population.
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