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Throat Infections: Common Microorganisms and Causes

Throat infections can be caused by bacteria, viruses, and fungi.

Bacteria

  • Streptococcus pyogenes (strep throat)
  • Staphylococcus aureus
  • Streptococcus pneumoniae
  • Haemophilus influenzae
  • Mycoplasma pneumoniae
  • Chlamydia pneumoniae
  • Neisseria gonorrhoeae

Viruses

  • Influenza, parainfluenza, RSV, adenoviruses, herpes simplex, Epstein-Barr, cytomegalovirus.

Fungi

  • Candida albicans (thrush)

Other

  • Mycoplasma hominis, Ureaplasma urealyticum.

Causative agent depends on age, immune status, exposure, geography, season.

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