$B.C.G.$ vaccine is used against

$T.B.$ (Tuberculosis) is caused by:

In cabbage,......... disease is caused by bacteria.

Write a note on the causative agent and symptoms of typhoid fever.

$S -$ Assertion: In typhoid,there is abdominal pain,constipation,and inflammation in the small intestine.
$R -$ Reason: In the diseased condition,$Salmonella$ $typhi$ is found in the human intestinal tract.

Widal test is used for the diagnosis of