Multiple choice Which of the following is a genus of microaerophilic bacteria? Campylobacter Bacteroides Clostridium Bacillus Escherichia Reveal answer Fill a bubble to check yourself A Correct answer Explanation Campylobacter is a genus of bacteria that are Gram-negative, spiral, and microaerophilic. Microaerophiles require oxygen levels in the range of 2 to 10% for their growth and are damaged by the normal atmospheric level of oxygen (20%).