Which organism is responsible for the plague?

Plague is a bacterial disease caused by

The incubation period of $Streptococcus$ $pneumoniae$ (pneumococcus) is.........

Given below are two statements $:$
Statement-$I$ : Typhoid fever can be confirmed by the Widal test.
Statement-$II$ : Intestinal perforation and death may occur in severe cases of typhoid.
In the light of the above statements,choose the correct answer from the options given below $:$

Lung tuberculosis is caused by

Leprosy is caused by