Hemophilus influenzae type b.
D000667:Ampicillin; D006192:Haemophilus Infections / Q000382:microbiology*; D006193:Haemophilus influenzae / Q000145:classification*; D006801:Humans; D007231:Infant, Newborn; D010403:Penicillin Resistance
D000667:Ampicillin