Cancer is when a multicellular organisms cells divide uncontrollably which causes problems by taking resources and damaging other cells in the same organisim.
Bacteria multiplying uncontrollably is just overpopulation. This tends to be called a bloom, as the bacteria rapidly divide, consume far to many resources from their environment and then mostly die.
Bacteria that infect you and multiply uncontrollably is just a severe infection.
Bacteria reproduce through a process called binary fission. During binary fission, the chromosome copies itself, forming two genetically identical copies. This happens over and over. Binary fission can happen very rapidly. Some species of bacteria can double their population in less than ten minutes. This process makes it possible for a tremendous bacterial colony to start from a single cell.
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