Yersin was also able to demonstrate for the first time that the same bacillus was present in the rodent as well as in the human disease, thus underlining the possible means of transmission.
Yersin juga mampu menunjukkan untuk pertama kalinya bahwa bacillus yang sama hadir di hewan pengerat serta dalam penyakit manusia, sehingga menggarisbawahi kemungkinan cara penularannya.