%0 Journal Article %A Noah, N %A Ramsay, M %A Twisselmann, B %T Imported cases of polio in Bulgaria – vaccination campaign postponed %D 2001 %J Weekly releases (1997–2007) %V 5 %N 21 %P 1747 %R doi:https://doi.org/10.2807/esw.05.21.01747-en %K vaccines and immunisation %K poliomyelitis %U https://www.eurosurveillance.org/content/10.2807/esw.05.21.01747-en