Which one of the following is not a viral disease?

Viruses,which cause hepatitis,are transmitted through

Study the given chart carefully and fill in the blanks $(a)$,$(b)$,and $(c)$:

$S$.No.	Name of the disease	Causative organism	Mode of transmission
$1$. Polio	$(a)$	Infection of virus directly/orally
$2$. $(b)$	Lyssa virus	Virus enters human body with saliva of an infected animal
$3$. Typhoid	Salmonella typhi	$(c)$

Mahima is suffering from cholera. It is likely that the children sitting around her will be exposed to the infection:
$(a)$ Do all the students get infected and suffer from disease?
$(b)$ List two major symptoms of cholera.
$(c)$ What are the different ways of spread of this disease?

$A$ person was bitten by a stray dog. After some days,his nature became irritated,and he started fearing water.
$(a)$ Name the disease.
$(b)$ Is there any vaccine plan available?
$(c)$ Is there any plan of your local authority for the control of this disease?

How are signs of a disease different from symptoms of a disease?