Webster's New World Medical Dictionary

kissing disease
Nickname for infectious
mononucleosis. See also 
mononucleosis.
kit, disaster supplies
See 
disaster supplies.
Klebsiella
A group of bacteria that normally lives
in the intestinal tract, but can cause infections when
the microorganism infects tissues of the body.
Klebsiella are frequently the cause of infections
acquired in hospitals.
Kleine-Levin syndrome
A rare condition that is
characterized by periods of excessive drowsiness
and sleep, lasting up to 20 hours per day. Affected
individuals usually have excessive food intake and
may be confused, irritable, and lethargic. Some
patients have hallucinations or sexual disinhibition.
Most patients with Kleine-Levin syndrome are ado-
lescent males. The cause is unknown. Most cases
resolve over time without treatment. Also known as
Kleine-Levin hibernation syndrome.
Klinefelter syndrome
A condition in males who
have XXY sex chromosomes, rather than the usual
XY. Some also have additional X chromosomes, or
more than one Y chromosome. XXY is one of the
most common chromosomal abnormalities. It
occurs in 1 in 500 male births. The signs of
Klinefelter syndrome include small testes, insuffi-
cient production of testosterone, and infertility. XXY
males are more likely than other males to show
breast enlargement, lack of facial and body
hair, and a rounded body type, and they are more
likely than other males to be overweight and be
taller than their fathers and brothers. Klinefelter
boys tend to have learning and/or behavioral
problems.
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