Pigs in Canada may be first in recent outbreak to test positive for virus . South Korean officials on Saturday confirmed their first case -- a 51-year-old nun who recently traveled to Mexico for volunteer work . One - third of 160 sick Americans visited Mexico or had contact with Mexico . WHO reports 37 confirmed cases of H1N1 infection in 15 countries .
Pigs in Canada may be first in recent outbreak to test positive for virus . One - third of 160 sick Americans visited Mexico or had contact with Mexico . WHO reports 37 confirmed cases of H1N1 infection in 15 countries .