title: Culture-negative endocarditis.
mesh_terms: D003470:Culture Media; D003545:Cysteine; D004698:Endocarditis, Subacute Bacterial / Q000382:microbiology*; D006801:Humans; D011736:Pyridoxine; D013291:Streptococcus / Q000254:growth & development / Q000302:isolation & purification
chemical_list: D003470:Culture Media; D003545:Cysteine; D011736:Pyridoxine