Two cases of plague have been confirmed in China,... raising concerns over the possible spread of the illness to South Korea.<br />However, Korean health officials say the risk of the highly contagious disease spreading here is very low,.. adding they have enough vaccines in stock, even if an outbreak was to occur.<br />Pneumonic plague plague causes symptoms such as fever, headache and vomiting.<br />If left untreated, it has a mortality rate of nearly 100-percent.<br />
