Streptococcus Agalactiae

Streptococcus AgalactiaeStreptococcus agalactiae is a gram +ve cocci and causes beta-hemolysis of RBCs in the blood agar. It is a catalase -ve bacterium and therefore it does not respond to the catalase test. It has a polysaccharide capsule because of what, it is of more pathogenic nature.

Colonization

As this bacteria is pathogenic to humans, therefore it can colonize at the following sites in the human body

  • Intestines
  • Vagina
  • Urinary tract

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Virulence Factors of Streptococcus Agalactiae

Virulence factors are the factors, which a microorganism possess to causes disease in the host. These organisms have the following virulence factors

  • A polysaccharide capsule
  • Beta-hemolysin toxin

Laboratory Diagnosis

  1. It causes beta-hemolysis of RBCs in the blood agar, because of this, they can be identified.
  2. They are CAMP-test +ve

Infections Because of S. Agalactiae

As this organism is pathogenic in nature, therefore it causes the following infections:

  • Urinary tract infection
  • Neo-natal septicemia
  • Meningitis
  • Sepsis

Treatment

Penicillin or Ampicillin have been proven to be effective against Strep Agalactiae. Because these organisms are not resistant to penicillin majority of the times. Therefore penicillin or ampicillin are used against these bacteria.

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