Show PREVALENCE OF DIPHTHERIA Believed to Bo Caused by iTonBacog nition of Mild Cases The prevalence of diphtheria In tho city Is accounted for by a prominent physician on the theory that many truo cases of tho disease aro not recognized as such because they are of such a mild type Consequently many diphtheria patients mingle with their friends and other members mem-bers of tho family and Ignorantly spread the Infection Tho cases contracted from a mild attack are Just as npt to prove sprlouu OH thoro contracted from the dls onKoHn Its most virulent form To remedy Condition of affairs tho health official of-ficial urge that even when sufforlnic from what Is 1 apparently nothing ml1l8 dangerous than a sore throat tho patient should have a bacteriological teat mndq and remain Isolated until the truo nature ot tho affection IB adentltlcally determined deter-mined |