A recent outbreak of the paralyzing viral infection polio in Haiti and the Dominican Republic has been traced to a strain of oral polio vaccine (OPV) that mutated back to virulence, according to international health officials.
Based on genetic analysis of viral samples, they believe the outbreak, which struck nearly two dozen children in both countries between 2000 and 2001, arose from OPV given to one child in 1998-1999.
http://www.mercola.com/2002/mar/30/polio.htm
Based on genetic analysis of viral samples, they believe the outbreak, which struck nearly two dozen children in both countries between 2000 and 2001, arose from OPV given to one child in 1998-1999.
http://www.mercola.com/2002/mar/30/polio.htm