In September $2001$,which of the following was used as a bioweapon agent in America?

The turning of lips and fingernails from grey to bluish in color indicates an infection of:

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

What is the shape of the pathogen responsible for the disease pneumonia?

Plague is a bacterial disease caused by

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.