A harmful bacteria can kill tons of humans.
Carrying these harmful bacterias can infect many other healthy humans.
The bacteria can also be very helpful.
Entering a human body, the bacteria can ruin everything inside the body.
Rats can carry harmful bacteria around.
I think harmful bacterias are very dangerous.
A helpful bacteria can make a human's body healthy.
Website: http://www.associatedcontent.com/article/51175/understanding_bacteria_harmless_and.htm
Website: http://www.ctds.info/helpful_bacteria.html
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