Open AccessImported cases of polio in Bulgaria – vaccination campaign postponed
Author(s) -
Norman Noah,
Mary Ramsay,
B Twisselmann
Publication year - 2001
Language(s) - English
Resource type - Journals
ISSN - 9999-1233
DOI - 10.2807/esw.05.21.01747-en
Subject(s) - poliomyelitis , polio vaccination , vaccination , virology , geography , medicine , poliovirus , virus