pneumococcus
Noun
Meaning
A form of micrococcus found in the sputum (and elsewhere) of persons suffering with pneumonia, and thought to be the cause of this disease.
Source: Webster's dictionarySynonyms
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Griffith used two strains of pneumococcus ( Streptococcus pneumoniae ) bacteria which infect mice a type III-S (smooth) which was virulent, and a type II-R (rough) strain which was nonvirulent.
Griffith's experiment discovering the "transforming principle" in pneumococcus bacteria.
Griffith was also able to isolate both live II-R and live III-S strains of pneumococcus from the blood of these dead mice.
The ability of the pneumococcus to cause deadly infections is different in each of these six states.