How many types of bacteria are there?

By Susan Brewer, Ph.D., University of Illinois,
Department of Food Science and Human Nutrition
 

Thousands (if not millions).  They are grouped, then sub-grouped, then sub-sub-grouped based on growth characteristics, nutrient requirements, etc.  New ones are being discovered every day.
 
Source(s):
Susan Brewer, Ph.D., University of Illinois, Department of  Food Science and Human Nutrition

 
 

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