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Found this answer on examville.com, when I was searching the net for my homework assignment.Milk supports the growth of a variety of bacteria including pathogenic one The different types of bacteria present in milk are, as follows: 1. Acid-fonning bacteria, such as Streptococcus lactis Str. faecalis Lactobacilli These ferment lactose, forming lactic acid, and lead to the formation of curd. 2. Alkali-fonning bacteria, such as Alkaligenes sp. Achromobacter Aerobic spore-forming bacilli These render the milk alkaline. 3. Gas-forming bacteria, such as Coliform bacteria Cl. peifringens Cl. butyricum These produce acid and gas. 4. Proteolytic bacteria, such as Bacillus subtilis B. cereus Proteus vulgaris Staphylococci Micrococci These bacteria are responsible for proteolytic activity. 5. Inert bacteria, such as Achromobacter Pathogenic bacteria Cocci They do not produce any visible change.
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