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  • S. pneumoniae can colonize the respiratory tract, sinuses, and nasal cavity of healthy people without causing problems. But in people with weak immune systems, the bacteria can cause disease.
    Photo by Manu5/CC BY-SA 4.0
    S. pneumoniae can colonize the respiratory tract, sinuses, and nasal cavity of healthy people without causing problems. But in people with weak immune systems, the bacteria can cause disease.
  • S. pneumoniae burst when their growth is arrested by antibiotics like penicillin or when they run out of nutrients, as shown here.
    Josué Flores-Kim and Andrew Fenton
    S. pneumoniae burst when their growth is arrested by antibiotics like penicillin or when they run out of nutrients, as shown here.
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