Group B

noun

: any of various strains of a streptococcus (Streptococcus agalactiae) that include the causative agents of certain infections (such as pneumonia and meningitis) especially of newborn infants

—usually used attributively

Group B streptococcal infections

Word History

First Known Use

1965, in the meaning defined above

Medical Definition

Group B

noun

-ˈbē 

: the Lancefield group of usually beta-hemolytic streptococci that comprises all strains of a species of the genus Streptococcus (S. agalactiae) and that includes the causative agents of certain infections (as septicemia, pneumonia, and meningitis) especially of newborn infants

—usually used attributively

affected with Group B strep

compare group a