DANIELA BECKMANN / SCIENCE PHOTO LIBRARY DANIELA BECKMANN / SCIENCE PHOTO LIBRARY
Culture of Streptococcus pyogenes (group A streptococci) on blood agar. Streptococcus pyogenes can colonize the upper respiratory tract without signs of disease, but generally it is a pathogen of humans with a wide range of diseases. Most common is the inflammation of the pharynx but it can also cause life-threatening infections such as skin or soft-tissue infections.
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