Cellular
Hypersensitivity
This
type
is
an
exaggeration
of
the
process
of
cellular
immunity
discussed
earlier.
There
is
contact
between
T-Iymphocytes
and
antigens.
where
Iymphokines
act
as
mediators.
Lymphokines
are
a
series
of
luymphoblast
derived
proteins
that
increase
the
efficiency
of
phagocytosis
of
antigens.
This
type
of
hypersensitivity
is
a
delayed
reaction
whose
maximal
effect
is
not
seen
until
24
to
72
hours
have
elapsed.
It
is
characterised
by
a
thickening
and
drying
of
skin
tissue,
a
process
called
induration,
and
a
surrounding
zone
of
erythema
(redness).
