isis answered Sunday June 3 2007, 7:07 pm: It's a disease caused by a germ, usually affecting the lungs but other parts of the body can get it as well. It's a very serious condition and pre-vaccination and in Third World countries it has caused a lot of deaths. It's generally passed by close contact and it's mostly the young, weak and elderly are the most vulnerable.
I have included a web site that will give you more indepth information.
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