plaque

plague is the best-known variant of the deadly infectious disease, which is caused by the black rats, prairie dogs, chipmunks, squirrels. Human infection most often occurs when a person is bitten by a rat flea that has fed on an infected rodent. The bacteria multiply inside the flea, sticking together to form a plug that blocks its stomach and causes it to become very hungry. The flea then voraciously bites a host and continues to feed, even though it is unable to satisfy its hunger. During the feeding process, blood cannot flow into the blocked stomach, and consequently the flea vomits blood tainted with the bacteria back into the bite wound. Thus making vommitings, chills, fever, diarrhea, headaches etc features in the affected man.

chek this link to know all kinds of plaques tat are commanly occuring http://en.wikipedia.org/wiki/Plaque

Plaque is excess food that turn rotten on the tooth and slowly eats away at the enamel of your tooth..

all I know is something that builds up on your teeth.

Plaque is the poo of the bacterias that are on your teeth.

i do think about that too...