These are bacteria which require oxygen to live (they use it for cellular respiration). There are also anaerobic bacteria, which spend their lives in nonoxygenated environments.
Mycobacterium tuberculosis is an example obligate aerobic bacteria. It infests the lungs of mammalian hosts because that is where the most oxygen is.
They are bacteria that survive in the presence of oxygen. That is, they do not survive without oxygen. These are known as obligate aerobic bacteria. However, there are those that require oxygen at low concentration. They are known as microaerophiles. Those not affected by oxygen are called aerotolerant bacteria.
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