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Driving people into crowded cities and use of crowded "public" transportation increases the probability of spreading between infected individuals. Misuse of antibiotics expands the probability of multiple drug resistant strains.

My great great grandparents in Ysbty Ystwyth, Wales both succumbed to TB. My great grandfather and his sisters were too young to retain legal ownership of the family home. They were taken in by "Uncle Dave" in Lllanfihangel-y-Creuddyn until they opted to emigrate to the U.S. at their own expense. My great grandfather signed on as "ship's company" on a vessel leaving Liverpool. On arrival to the USA, he reconnected with his future wife in Pittsburgh and served in the Union army from 1863 to 1865.