. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . Fig. 116.—Non-virulent diphtheria ba-cilli, showing stain with Neissers appearance was formerly supposedto be characteristic of virulent of bacilli in smear, yellowish brown ;granules, dark Fig. 117.—B. diphtheria agar small and uniform in shape. X 1000diameters. >^%^^ m ^-«( Fig. 119.—B. diphtheriae. Forty-eighthours agar culture. Many segments; long,Indian-clubbed ends. One year on artifi-cial media. X 1410 diameters.

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