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a nonspore-forming, gram-positive, and nonmotile rod that measures 0.5–0.8 × 1.0–1.5 μ. In young cultures, the rods are twisted and slightly branched, while in older cultures they are coccoid.

Propionibacteria form yellow, orange, or red colonies and grow under both aerobic and anaerobic conditions. They are nonpathogenic and live in dairy products (except milk) and in the rumen and intestine of ruminants. Propionibacteria are the causative agents of propionic-acid fermentation. They ferment glucose, lactose, and other carbohydrates; they also ferment some alcohols, forming propionic and acetic acids and CO2 as a result. Enzymes that contain propionibacteria are used in cheese-making: the openings and the flavor and aroma of Swiss cheese are largely determined by propionic-acid fermentation. Propionibacteria are used in the microbiological synthesis of vitamin B12. Various nutrient media that contain cobalt are used to grow propionibacteria.


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Studies focusing on healthy volunteers have demonstrated that Staphylococcus , Micrococcus , Corynebacterium , Brevibacteria, Propionibacteria, and Acinetobacter species regularly reside in normal skin.
After 28 days of treatment, the antibiotic-treated facial skin had significantly less Actinobacteria species, including corynebacteria and propionibacteria.
acidophilus, Leuconostoc lactis, Bifidobacterium longum (11), and some strains of Propionibacteria (12 13).
Acne is not an infectious disease in the classical sense; however, inflammatory acne can be viewed as an infection of the blocked pilosebaceous ducts with Propionibacteria which are trapped by cornified plugs within the follicular ducts.
More specifically, topics addressed in the first section include identification of new protective cultures and culture components, antifungal lactic acid bacteria and propionibacteria, and the potential of reuterin produced by Lactobacillus reuterie as a broad spectrum preservative.
Most bacterial DFM for young calves contain LAB, whereas dairy propionibacteria are rarely used.
The researchers also discovered differences in infant flora by body site, with streptococci, staphylococci, and propionibacteria being most prevalent on the forehead; streptococci, staphylococci, and corynebacteria being most prevalent on the arms; and clostridia, streptococci, and ruminococci being most prevalent on the buttocks.
Propionicin PLG-1 (MW 10000 Da) was reported to be active against a variety of microorganisms such as propionibacteria and many other G(+) and G(-) bacteria and even yeasts and fungi [1].
Coates P, Vyakrnam S, Eady EA, Jones CE, Vove JH, Cuncliff WJ: Prevalence of antibiotic-resistant propionibacteria on the skin of acne patients: 10year surveillance data and snapshot distribution study.
The effects of acne treatment with a combination of benzoyl peroxide and erythromycin on skin carriage of erythromycin-resistant propionibacteria.