RT Journal Article SR Electronic T1 Letter: Incidence of Yersinia enterocolitica and Y. pseudotuberculosis infections in Canada; 1975 semiannual report JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 16 OP 16 VO 114 IS 1 A1 S. Toma A1 V. R. Deidrick YR 1976 UL http://www.cmaj.ca/content/114/1/16.abstract