Lactobacillus acidophilus

  • General information

    • the following information is not yet verified
      Lactobacillus species produce lactic acid as their single or major metabolic end product from glucose fermentation

      Family: Lactobacillaceae

      Natural habitats
      They are widely distributed in the environment
      They belong to the normal flora of the intestine, urogenital tract and mouth.

      Clinical significance
      Despite the reputation of lactobacilli as beneficial organisms, they can be involved in serious infections, especially in immunocompromised individuals.

      Lactobacilli are particularly associated with advanced dental caries, where they are considered a secondary colonizer because of their preference for low-pH habitats, but probaply play a role in exacerbating existing lesions.

      The clinical infections most commonly caused by lactobacilli are bacteremia and endocarditis, with an associated relatively high mortality rate, with the mouth, the primary route of entry to the bloodstream.

  • Gram stain

    • the following information is not yet verified
      Gram positive rods, short or long, slender: in chains
      with rounded ends, occurring singly, in pairs, and in chains.

      0.6-0.9 x 1.5-5.0 µm,

  • Culture characteristics

    • the following information is not yet verified

      Facultative anaerobic

      5% CO2 stimulates growth

      Lactobacillus: are small, convex, opaque colonies without pigment with sometimes a greening zone (morphology of a greening streptococcus) or aging of the medium

      L. acidophilus
      BA: colonies are rough, showing fuzzy outlines; deep colonies are irregular shaped with radiate or ramified projections.

      McConkey: no growth (variable)

      BBAØ: growth (they grow better anaerobic)

  • Characteristics

  • References

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