You had a patient with a suspected bacterial infection, you gave him the antibiotic, and without really needing to know anything else about the bacteria causing the disease, many of the patients recovered.
у пациента подозревали бактериальную инфекцию, давали антибиотик и, ничего не зная о бактерии, вызвавшей болезнь, излечивали многих больных.