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Aerobic bacteria require oxygen for cellular respiration, while anaerobic bacteria do not require oxygen and cannot grow in the presence of it. They produce energy through fermentation. They are similar in the the fact they can share nutritional requirements.
Anaerobic bacteria are germs that can survive and grow where there is no oxygen. For example, it can thrive in human tissue that is injured and does not have oxygen-rich blood flowing to it. Infections like tetanus and gangrene are caused by anaerobic bacteria. Anaerobic infections typically cause abscesses (buildups of pus), and death of tissue. Many anaerobic bacteria produce enzymes that destroy tissue and, sometimes, potent toxins. Besides bacteria, some protozoans and worms are also anaerobic.