AIDS is characterised by a sharp reduction is
Helper $T-$ cells
Killer $T-$ Cells
Suppressor $T-$ Cells
$B-$ lymphocytes
$A$ : Live attenuated vaccine is better in terms of immunity provided to the recipient.
$R$ : As secondary lymphoid organs, example peyer's patches are stimulated to protect the individual.
Malignant malaria is caused by
The spread of cancerous cells to distant sites is termed as
During conjugation in Paramecium
Which of the following disease is due to an allergic reaction