Nutrose agar. | ----------------------------------- | | Red colonies. Blue colonies. Escherich group. Gaertner and Eberth groups. || | ====================--------------- || Lactose peptone solution. || ====================--------------- || | Gas. No gas. || | B. coli communis and its allies. | || Gaertner and Eberth groups. Acid and gas in glucose peptone solution. | Acid and coagulation in milk. | General turbidity and indol in bouillon. Glucose peptone solution. | ==================================| || | || | Gas. No gas. || | Gaertner group. Eberth group. || | =================== ---------------- || || | | || || | | Litmus milk. Peptone solution. Litmus milk. Peptone solution. || || | | Acid at first. General turbidity. Acid. General turbidity. Alkaline later. No indol. No coagulation. No indol. No coagulation. Serum reaction. Serum reaction. _B. Streptococci._ 19. Pick off streptococcus colonies and subcultivate upon nutrient agar exactly as directed in steps 14, 15 and 16. 20. Differentiate the streptococci isolated into members of the saprophytic group of short-chained cocci, or members of the parasitic (pathogenic) group of long-chained cocci, by means of their cultural characters, and record their numerical frequency in the manner indicated for the members of the coli-typhoid group. DIFFERENTIAL TABLE OF COLI-TYPHOID GROUP Transcriber's note: Table split to fit 80 spaces.