One day last winter Dr. John Henry McLeod of Washington bent over an eight-month-old baby who lay coughing and rattling in his crib. The baby had a bad case of flu, as he could tell for sure when he examined under the microscope slides made from the baby's tears and saliva. What he saw was swarms of vicious pneumococci and tiny, rod-shaped, bloodsucking Hemophilus influenzae, most common of the numerous organisms connected with flu. To combat the pneumococci, he gave the baby injections of the remarkable new drug sulfapyridine. Against the Hemophili he...
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