‘Plague' is transmitted by

Damage to thymus in a child may lead to

Which drugs quickly reduce the symptoms of allergy ?

Which of the following causes malaria

The region in the body where the polio virus multiplies is

$A$ : $A$ person who has received a cut accidentally and is bleeding needs to be given anti-tetanus treatment.
$R$ : Anti-tetanus injection provides active immunity by providing preformed antibodies for tetanus.