If you live in an overcrowded and poorly ventilated house,it is possible that you may suffer from which of the following diseases?

Bacterial diseases are:

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	$(c)$

Which of the following is not an infectious disease?

How does the $HIV$ virus affect the body and kill the affected person?

It was diagnosed that a patient has lost the power of fighting against any infection.
$(i)$ Name the disease from which the patient is suffering.
$(ii)$ Name the pathogen responsible for the disease.