If yes. Does it change its shape in every disease, or does it remain in the same shape and cause several diseases?
closed as too broad by David, Bryan Krause♦, Satwik Pasani, kmm, AliceD♦ May 7 '18 at 19:31
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Yes, one type of bacteria can cause multiple diseases. For example:
"Rheumatic fever is caused by group A Streptococcus. This bacterium causes strep throat or, in a small percentage of people, scarlet fever. It’s an inflammatory disorder." [https://www.healthline.com/health/rheumatic-fever#causes].
The difference is in how the individual's immune system responds to the infection (and how the infection is treated). Everyone responds a bit differently to the same infection.