title: Reversion of alpha- into beta-hemolysis of Diplococcus pneumoniae by low concentration of optochin.
mesh_terms: D002555:Cerebrospinal Fluid / Q000382:microbiology; D002929:Cinchona / Q000494:pharmacology*; D006461:Hemolysis / Q000187:drug effects*; D010946:Plants, Medicinal; D013183:Sputum / Q000382:microbiology; D013296:Streptococcus pneumoniae / Q000187:drug effects*; D013492:Suppuration / Q000382:microbiology