Regular Nonsporing Gram Positive Rods

Regular, non-sporing gram-positive rods are obligate or facultative anaerobes that have a rod-shaped appearance as is implied by its name. They inhabit fermenting plants and animal products. There are four genera within this section. These are:

• The genus, Lactobacillus are non-sporing gram-positive rods. These are aerotolerant bacteria that produce lactic acid from simple carbohydrates. The acidity inhibits competing bacteria. An example of a Lactobacillus organism is the species Lactobacillus acidophilus.

• Lactobacillus acidophilus is found in the human intestinal tract, oral cavity and adult vagina. They produce an acidic environment that inhibits the growth of harmful bacteria by fermenting glycogen into lactic acid. Lactobacillus acidophilus is also used commercially to produce an assortment of food products including sauerkraut, pickles, buttermilk and yogurt.

Other examples of regular non-sporing gram-positive rod bacteria are:

• Listeria monocytogenes. Listeria monocytogenes contaminates food and dairy products, if ingested can cause the disease listeriosis, which causes an inflammation of the brain and meninges (meningitis).

Erysipelothrix rhusiopathiae. Erysipelothrix rhusiopathiae causes erysipeloid, which is red, swollen and painful lesions, frequently seen in fishermen and meat handlers.

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