Wild poliovirus was eradicated in the Western Hemisphere in 1991... ...however, an outbreak of vaccine-derived poliovirus type 1 occurred in the Dominican Republic and Haiti in July 2001 Reservoir countries include Bangladesh, Democratic Republic of the Congo, Ethiopia, India, Nepal, Nigeria, Pakistan, Afghanistan, Angola, Liberia, Sierra Leone, Somalia, Sudan, and Tajikistan1 Cases of vaccine-derived polio were recently reported in Haiti, Dominican Republic, and the Philippines2,3   CDC recommends vaccination for1: Adults who are traveling to polio-endemic areas and are unimmunized Traveling adults whose vaccination status is unknown Children at 2, 3, and 6 through 18 months of age and 4 through 6 years of age   References: 1. Centers for Disease Control and Prevention (CDC). Health Information for International Travel 2001-2002. Atlanta, Ga: US Dept of Health and Human Services; 2001:131-133. 2. Landaverde M, Venczel L, de Quadros CA. Poliomyelitis outbreak caused by vaccine-derived virus in Haiti and the Dominican Republic [in Spanish]. Rev Panam Salud Publica. 2001;9:272-274. 3. CDC. Acute flaccid paralysis associated with circulating vaccine-derived Poliovirus—Philippines, 2001. MMWR Morb Mortal Wkly Rep. 2001;50:874-875