Bacteria like Streptococcus pneumoniae and Haemophilus influenzae are responsible for Pneumonia in humans.

Bacteria infects the alveoli(air filled sacs) of the lungs.

As a result of infection, the alveoli gets filled with fluid leading to severe problems in respiration.

Because of fluid filled in the alveoli, diffusion of gases is not able to take place and oxygen does not reach the blood capillaries.

The symptoms of pneumonia include fever, chills, cough and headache.

In severe cases lips and finger nails may turn gray to bluish in color.

A healthy person acquires the infection by inhaling droplets/aerosols released by an infected person or even by sharing glasses and utensils with an infected person.