Controlled field trial in British Guiana school children of heat-killed-phenolized and acetone-killed lyophilized typhoid vaccines / M.T. Ashcroft, J. Morrison Ritchie and C.C. Nicholson.

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Ritchie, J. Morrison.

Works from the collections

Controlled field trial in British Guiana school children of heat-killed-phenolized and acetone-killed lyophilized typhoid vaccines / M.T. Ashcroft, J. Morrison Ritchie and C.C. Nicholson.