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

Assertion: $Escherichia$ $coli$,$Shigella$ $sp.$ and $Salmonella$ $sp.$ are all responsible for diarrhoeal diseases.
Reason: Dehydration is common to all types of diarrhoeal diseases and adequate supply of fluids and electrolytes should be ensured.

Which of the following is $NOT$ a symptom of pneumonia?

The incubation period of $Salmonella$ $typhi$ is.........

Which of the following is a diagnostic test for typhoid?

Typhoid fever is caused by which of the following?