Through which organ do the pathogens of typhoid enter the human body?

Which of the following pathogens is responsible for pneumonia?

Which of the following is a serious lung disease?

Citrus canker is a:

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.

Salmonella is associated with .......