Studies on streptococci.  IV.  A study of the relationship of certain virulence factors in streptococcal infections to the LD 50 dose of streptococci.
D013290:Streptococcal Infections; D013291:Streptococcus; D037521:Virulence Factors
D037521:Virulence Factors
STREPTOCOCCAL INFECTIONS/experimental