RT Journal Article SR Electronic T1 Case report: probable transmission of vaccine strain of yellow fever virus to an infant via breast milk JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E243 OP E245 DO 10.1503/cmaj.100619 VO 183 IS 4 A1 Susan Kuhn A1 Loreto Twele-Montecinos A1 Judy MacDonald A1 Patricia Webster A1 Barbara Law YR 2011 UL http://www.cmaj.ca/content/183/4/E243.abstract AB The 17D yellow fever vaccine is a live-virus vaccine that has been in use since the 1940s. The incidence of encephalitis after yellow fever vaccination among young infants is much higher than among children older than nine months of age. Until recently, avoidance of vaccination by breastfeeding women who have received yellow fever vaccine had been based on theoretical grounds only. We report the probable transmission of vaccine strain of yellow fever virus from a mother to her infant through breastfeeding.