By breathing among people. Bubonic plague not spread that way. Black Death seems to have often been contagious person to person
eg http://www.nature.com/scitable/blog/viruses101/could_the_black_death_actually … But claims this explains whole thing no good either coz buboes & Y.Pestis found in remains of victims.
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Its a mystery likely to be solved in our lifetime coz medievalists are on it in combination with medical scientists.
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