TY - JOUR T1 - Diphtheria: a continuing hazard JF - Canadian Medical Association Journal JO - CMAJ SP - 1226 LP - 1227 VL - 116 IS - 11 AU - E. M. Cooperman Y1 - 1977/06/04 UR - http://www.cmaj.ca/content/116/11/1226.abstract ER -