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" ... In other words, the plague found itself set loose in a world that knew exactly what it was and had the resources to fight it. Yersin had identified the bacterium in 1897, and that same year, researchers began to connect the spread of the plague with the presence of flea-infested rats. Port cities around the world began to check ships for sick crew members, dead rats, and signs of rats or fleas among the cargo. Local sanitary authorities also searched cities for dead rats, and tested them for Yersina pestis. Some cities, like Venice in 1897, established quarantines and set strict requirements for hygiene and cleanliness aboard incoming ships. ... "
" ... Yersin described it as a rod-shaped microbe which didn't move on its own, whose cell walls wouldn't retain a violet dye called a Gram stain (Gram-negative bacteria like Y. pestis are often harder to treat beacuse they have an extra protective membrane that Gram-positive bacteria lack). Yersin was correct on all counts. ... "