Alphahemolysis Characteristic Streptococcus Pneumoniae On Blood Stock Streptococcus pneumoniae and other streptococci produce a greenish halo on blood agar plates referred to as alpha hemolysis. this phenotype is utilized by clinical microbiology laboratories to report culture findings of alpha hemolytic streptococci, including s. pneumoniae, and other bacteria. Streptococcus pneumoniae (pneumococci) is a part of the normal nasopharyngeal and oropharyngeal flora. it is an important etiological agent of upper and lower respiratory tract infections (urti and lrti), bacteremia, and septicemia. streptococcus pneumoniae is also associated with otitis media, sinusitis, meningitis, and endocarditis.
Alphahemolysis Characteristic Streptococcus Pneumoniae On Blood Stock Importance there is a misconception that alpha hemolysis observed on blood agar plate cultures of streptococcus pneumoniae and other alpha hemolytic streptococci is produced by a hemolysin or, alternatively, by lysis of erythrocytes caused by hydro gen peroxide. we noticed in the course of our investigations that wild type s. pneu. Fig. 6b: streptococcus pneumoniae on blood agar showing alpha hemolysis note the partial hemolysis accompanied by a greenish discolorization of the agar around the growth. note the mucoid, transluscent colonies and the alpha hemolysis (partial hemolysis typically accompanied by a greenish discolorization of the agar around and under the growth). Hydrogen peroxide production by streptococcus pneumoniae results in alpha hemolysis by oxidation of oxy hemoglobin to met hemoglobin. The molecular basis of the alpha hemolysis halo produced by s. pneumoniae is demonstrated, which is caused by the oxidation of oxy hemoglobin to a non oxygen binding met hemobic form of oxygen by s pneumoniae produced hydrogen peroxide. there is a misconception that alpha hemolysis observed on blood agar plate cultures of streptococcus pneumoniae and other alpha hemolytic streptococci is.
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