STUDIES OF MICROBIAL POPULATIONS ARTIFICIALLY LOCALIZED IN VIVO. II. DIFFERENCE IN ANTITYPHOIDAL ACTIVITIES OF CHLORAMPHENICOL AND CHLORTETRACYCLINE

^{Department of Medicine, New York Hospital—Cornell University Medical Center, New York, N. Y.}

Postdoctorate Research Fellow, National Institutes of Health, U. S. Public Health Service during the period in which this study was conducted.

This study was aided in part by grants from Chas. Pfizer & Co., Brooklyn, N. Y.; the Lederle Laboratories Division, American Cyanamid Co., Pearl River, N. Y.; and the Division of Research Grants and Fellowships, National Institutes of Health, U. S. Public Health Service.

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^{Department of Medicine, New York Hospital—Cornell University Medical Center, New York, N. Y.}

Postdoctorate Research Fellow, National Institutes of Health, U. S. Public Health Service during the period in which this study was conducted.

This study was aided in part by grants from Chas. Pfizer & Co., Brooklyn, N. Y.; the Lederle Laboratories Division, American Cyanamid Co., Pearl River, N. Y.; and the Division of Research Grants and Fellowships, National Institutes of Health, U. S. Public Health Service.

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^{Department of Medicine, New York Hospital—Cornell University Medical Center, New York, N. Y.}

Postdoctorate Research Fellow, National Institutes of Health, U. S. Public Health Service during the period in which this study was conducted.

This study was aided in part by grants from Chas. Pfizer & Co., Brooklyn, N. Y.; the Lederle Laboratories Division, American Cyanamid Co., Pearl River, N. Y.; and the Division of Research Grants and Fellowships, National Institutes of Health, U. S. Public Health Service.

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^{Department of Medicine, New York Hospital—Cornell University Medical Center, New York, N. Y.}

Postdoctorate Research Fellow, National Institutes of Health, U. S. Public Health Service during the period in which this study was conducted.

This study was aided in part by grants from Chas. Pfizer & Co., Brooklyn, N. Y.; the Lederle Laboratories Division, American Cyanamid Co., Pearl River, N. Y.; and the Division of Research Grants and Fellowships, National Institutes of Health, U. S. Public Health Service.

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