What is pandemic ? How can we prevent it ?

Explanation

1) Disease which infects most of the people in a country (or) the whole world at the same time is called a pandemic.
2) We can prevent any disease (or) infection by improving our immunity.
3) Immunity is the inbuilt capacity of the body to fight and overcome the effects of disease causing germs.
4) This is taken care of by the white blood cells in the blood.