There
may
be
influenza,
nausea,
vomitting,
and
intestinal
cramps.
Disease
may
end
at
this
point.
However,
in
some
cases,
it
progresses,
and
the
virus
passes
to
the
bloodstream.
It
then
localises
on
the
gray
matter
of
the
spinal
cord.
The
word
polio
is
taken
from
the
Greek
polios
meaning
gray.
Meningitis
may
occur
and
paralysis
experienced
the
muscles
of
arms,
legs,
trunk
and
other
areas
controlled
by
spinal
cord.
This
condition
is
often
called
aseptic
meaningitis.
The
most
serious
form
of
polio,
is
the
one
in
which
the
virus
infects
the
stem
of
the
brain,
known
as
the medulla.
This
conditions
is
called bulbar
polio,
due
to
bulblike
appearance
of
the
medulla.
The
nerves
of
the
upper
body
torso
are
affected.
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