Cancer is a ......... disease,$AIDS$ is a ......... disease.

$DPT$ vaccine doses are administered at specific intervals after birth. Identify the correct sequence for the $1^{st}$, $2^{nd}$, and $3^{rd}$ doses of $DPT$ from the following list:
$I$. $6 \; \text{weeks}$ after birth
$II$. $10 \; \text{weeks}$ after birth
$III$. $14 \; \text{weeks}$ after birth
$IV$. $24 \; \text{weeks}$ after birth
$V$. $29 \; \text{weeks}$ after birth

Good health results in:

Who discovered the vaccine for smallpox?

The virus causing conjunctivitis spreads from one person to another through the air. Therefore,conjunctivitis is a:

Small solid structures located at various points in the lymphatic system are known as: