Immunization newsletter. - Washington, D.C. : Immunisation Unit of the Panamerican Health Or ganisation, 2006- - v. : ill. ; 28 cm. - Every two months - v. 28, no. 3 (June, 2006)- ISSN: 18146244 Subjects--Topical Terms: Immunization. Communicable Disease Control. Communicable Diseases -- epidemiology. National Library of Medicine Call No.: W1 / E42 2005