Normal
Flora
The
concpet
of
infection
in
the
host-parasite
relationship
is
expressed
in
the
body's
normal
flora.
Normal
flora
is
a
population
of
microorganisms
that
infect
the
body
without
causing
disease.
Some
organisms
establish
a
permanent
relationship,
as
E.
coli
is
always
found
in
large
intestines
of
humans.
Others
like
streptococci
are
transient.
Symbiotic
associations
between
body
and
its
normal
flora
exist
at
different
levels.
These
may
be
in
the
form
of
mutualism
or
commensalism.
Lactobacillus in
human
vagina
are
examples
of
mutualism.
They
derive
nutrition
from
vaginal
environment
and
the
acid
produced
by
them
prevent
the
overgrowth
of
other
microbes.
E.
coli
exists
as
a
commensal,
though
may
also
sometimes
exist
in
mutualistic
association.
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