Answer:
(a) Common cold is caused by rhinovirus and viruses have very
few biochemical mechanisms of their own. They enter our cell and use our
machinery for their life process. So, no antibiotic works against them.
(b) below age of one year are vaccinated against polio and
diphtheria.
(c) Symptoms of polio are
(i) Stiffness in neck and tingling sensation in limbs.
(ii) Ultimate paralysis and deformity of affected limb.
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